121102021992 has 128 divisors (see below), whose sum is σ = 361228584960. Its totient is φ = 33079791360.

The previous prime is 121102021991. The next prime is 121102021993. The reversal of 121102021992 is 299120201121.

It is an interprime number because it is at equal distance from previous prime (121102021991) and next prime (121102021993).

It is not an unprimeable number, because it can be changed into a prime (121102021991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9193603 + ... + 9206765.

It is an arithmetic number, because the mean of its divisors is an integer number (2822098320).

Almost surely, 2^121102021992 is an apocalyptic number.

121102021992 is a gapful number since it is divisible by the number (12) 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 121102021992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180614292480).

121102021992 is an abundant number, since it is smaller than the sum of its proper divisors (240126562968).

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

121102021992 is a wasteful number, since it uses less digits than its factorization.

121102021992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15583 (or 15579 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 121102021992 in words is "one hundred twenty-one billion, one hundred two million, twenty-one thousand, nine hundred ninety-two".