1211012020120 has 64 divisors (see below), whose sum is σ = 3131427859200. Its totient is φ = 412884528000.

The previous prime is 1211012020109. The next prime is 1211012020123. The reversal of 1211012020120 is 210202101121.

It is a super-2 number, since 2×1211012020120² (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 1211012020120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211012020123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12031006 + ... + 12131245.

It is an arithmetic number, because the mean of its divisors is an integer number (48928560300).

Almost surely, 2^{1211012020120} is an apocalyptic number.

1211012020120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211012020120 is an abundant number, since it is smaller than the sum of its proper divisors (1920415839080).

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

1211012020120 is a wasteful number, since it uses less digits than its factorization.

1211012020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24162448 (or 24162444 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1211012020120 its reverse (210202101121), we get a palindrome (1421214121241).

The spelling of 1211012020120 in words is "one trillion, two hundred eleven billion, twelve million, twenty thousand, one hundred twenty".