121029390279721 has 96 divisors (see below), whose sum is σ = 167373837803520. Its totient is φ = 86462829734400.

The previous prime is 121029390279709. The next prime is 121029390279757. The reversal of 121029390279721 is 127972093920121.

It is not a de Polignac number, because 121029390279721 - 2²⁹ = 121028853408809 is a prime.

It is a super-2 number, since 2×121029390279721² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121029390279221) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 108336825 + ... + 109448281.

It is an arithmetic number, because the mean of its divisors is an integer number (1743477477120).

Almost surely, 2^{121029390279721} is an apocalyptic number.

121029390279721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121029390279721 is a deficient number, since it is larger than the sum of its proper divisors (46344447523799).

121029390279721 is an equidigital number, since it uses as much as digits as its factorization.

121029390279721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111553 (or 1111525 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 55.

The spelling of 121029390279721 in words is "one hundred twenty-one trillion, twenty-nine billion, three hundred ninety million, two hundred seventy-nine thousand, seven hundred twenty-one".