121029390279720 has 256 divisors, whose sum is σ = 434475941760000. Its totient is φ = 29791063830528.

The previous prime is 121029390279709. The next prime is 121029390279757. The reversal of 121029390279720 is 27972093920121.

It is a happy number.

121029390279720 is a `hidden beast` number, since 1 + 2 + 10 + 293 + 9 + 0 + 279 + 72 + 0 = 666.

It is a super-2 number, since 2×121029390279720² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 674518257 + ... + 674697663.

It is an arithmetic number, because the mean of its divisors is an integer number (1697171647500).

Almost surely, 2^{121029390279720} is an apocalyptic number.

121029390279720 is a gapful number since it is divisible by the number (10) 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 121029390279720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217237970880000).

121029390279720 is an abundant number, since it is smaller than the sum of its proper divisors (313446551480280).

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

121029390279720 is a wasteful number, since it uses less digits than its factorization.

121029390279720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227489 (or 227479 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 54.

The spelling of 121029390279720 in words is "one hundred twenty-one trillion, twenty-nine billion, three hundred ninety million, two hundred seventy-nine thousand, seven hundred twenty".