1020100221220 has 48 divisors (see below), whose sum is σ = 2154865160448. Its totient is φ = 405636716160.

The previous prime is 1020100221199. The next prime is 1020100221233. The reversal of 1020100221220 is 221220010201.

It is a happy number.

It is a super-2 number, since 2×1020100221220² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1020100221220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2100217 + ... + 2539903.

It is an arithmetic number, because the mean of its divisors is an integer number (44893024176).

Almost surely, 2^{1020100221220} is an apocalyptic number.

1020100221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020100221220 is an abundant number, since it is smaller than the sum of its proper divisors (1134764939228).

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

1020100221220 is a wasteful number, since it uses less digits than its factorization.

1020100221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440380 (or 440378 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1020100221220 its reverse (221220010201), we get a palindrome (1241320231421).

The spelling of 1020100221220 in words is "one trillion, twenty billion, one hundred million, two hundred twenty-one thousand, two hundred twenty".