1212011002100 has 72 divisors (see below), whose sum is σ = 2732198128128. Its totient is φ = 466177046400.

The previous prime is 1212011002067. The next prime is 1212011002133. The reversal of 1212011002100 is 12001102121.

It is an interprime number because it is at equal distance from previous prime (1212011002067) and next prime (1212011002133).

It is a super-2 number, since 2×1212011002100² (a number of 25 digits) contains 22 as substring.

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, 758432 + ... + 1731831.

It is an arithmetic number, because the mean of its divisors is an integer number (37947196224).

Almost surely, 2^{1212011002100} is an apocalyptic number.

1212011002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212011002100 is an abundant number, since it is smaller than the sum of its proper divisors (1520187126028).

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

1212011002100 is a wasteful number, since it uses less digits than its factorization.

1212011002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490465 (or 2490458 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1212011002100 its reverse (12001102121), we get a palindrome (1224012104221).

The spelling of 1212011002100 in words is "one trillion, two hundred twelve billion, eleven million, two thousand, one hundred".