1210021121988 has 108 divisors (see below), whose sum is σ = 3561429139632. Its totient is φ = 345390847200.

The previous prime is 1210021121957. The next prime is 1210021122017. The reversal of 1210021121988 is 8891211200121.

It is a happy number.

It is a super-2 number, since 2×1210021121988² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1527631 + ... + 2180297.

Almost surely, 2^{1210021121988} is an apocalyptic number.

1210021121988 is a gapful number since it is divisible by the number (18) 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 1210021121988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1780714569816).

1210021121988 is an abundant number, since it is smaller than the sum of its proper divisors (2351408017644).

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

1210021121988 is a wasteful number, since it uses less digits than its factorization.

1210021121988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653742 (or 653730 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The spelling of 1210021121988 in words is "one trillion, two hundred ten billion, twenty-one million, one hundred twenty-one thousand, nine hundred eighty-eight".