1212021212220 has 576 divisors, whose sum is σ = 4742129683200. Its totient is φ = 248805623808.

The previous prime is 1212021212203. The next prime is 1212021212251. The reversal of 1212021212220 is 222121202121.

It is a happy number.

1212021212220 is a `hidden beast` number, since 1 + 212 + 0 + 21 + 212 + 220 = 666.

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 = 1212021212193 and 1212021212202.

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, 29676534 + ... + 29717346.

Almost surely, 2^{1212021212220} is an apocalyptic number.

1212021212220 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 1212021212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2371064841600).

1212021212220 is an abundant number, since it is smaller than the sum of its proper divisors (3530108470980).

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

1212021212220 is a wasteful number, since it uses less digits than its factorization.

1212021212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40899 (or 40880 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1212021212220 its reverse (222121202121), we get a palindrome (1434142414341).

It can be divided in two parts, 1212021 and 212220, that added together give a palindrome (1424241).

The spelling of 1212021212220 in words is "one trillion, two hundred twelve billion, twenty-one million, two hundred twelve thousand, two hundred twenty".