12102121211220 has 72 divisors (see below), whose sum is σ = 37701923577864. Its totient is φ = 3140009826048.

The previous prime is 12102121211209. The next prime is 12102121211237. The reversal of 12102121211220 is 2211212120121.

12102121211220 is a `hidden beast` number, since 1 + 21 + 0 + 212 + 1 + 211 + 220 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 516552688656 + 11585568522564 = 718716^2 + 3403758^2 .

It is a super-2 number, since 2×12102121211220² (a number of 27 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 = 12102121211193 and 12102121211202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 908560999 + ... + 908574318.

Almost surely, 2^{12102121211220} is an apocalyptic number.

12102121211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12102121211220 is an abundant number, since it is smaller than the sum of its proper divisors (25599802366644).

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

12102121211220 is a wasteful number, since it uses less digits than its factorization.

12102121211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817135369 (or 1817135364 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12102121211220 its reverse (2211212120121), we get a palindrome (14313333331341).

The spelling of 12102121211220 in words is "twelve trillion, one hundred two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty".