121929439320 has 768 divisors, whose sum is σ = 483971604480. Its totient is φ = 27321753600.

The previous prime is 121929439319. The next prime is 121929439321. The reversal of 121929439320 is 23934929121.

It is a happy number.

121929439320 is a `hidden beast` number, since 1 + 2 + 1 + 9 + 294 + 39 + 320 = 666.

It is an interprime number because it is at equal distance from previous prime (121929439319) and next prime (121929439321).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121929439321) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 66590805 + ... + 66592635.

It is an arithmetic number, because the mean of its divisors is an integer number (630171360).

Almost surely, 2^121929439320 is an apocalyptic number.

121929439320 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 121929439320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241985802240).

121929439320 is an abundant number, since it is smaller than the sum of its proper divisors (362042165160).

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

121929439320 is a wasteful number, since it uses less digits than its factorization.

121929439320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918 (or 1902 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 121929439320 in words is "one hundred twenty-one billion, nine hundred twenty-nine million, four hundred thirty-nine thousand, three hundred twenty".