1231102220220 has 576 divisors, whose sum is σ = 4178851762176. Its totient is φ = 292024074240.

The previous prime is 1231102220209. The next prime is 1231102220239. The reversal of 1231102220220 is 220222011321.

1231102220220 is a `hidden beast` number, since 123 + 1 + 102 + 220 + 220 = 666.

It is a super-2 number, since 2×1231102220220² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1231102220193 and 1231102220202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 607350847 + ... + 607352873.

It is an arithmetic number, because the mean of its divisors is an integer number (7254950976).

Almost surely, 2^{1231102220220} is an apocalyptic number.

1231102220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231102220220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2089425881088).

1231102220220 is an abundant number, since it is smaller than the sum of its proper divisors (2947749541956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231102220220 is a wasteful number, since it uses less digits than its factorization.

1231102220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250 (or 2245 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 1231102220220 its reverse (220222011321), we get a palindrome (1451324231541).

The spelling of 1231102220220 in words is "one trillion, two hundred thirty-one billion, one hundred two million, two hundred twenty thousand, two hundred twenty".