121329978 has 48 divisors (see below), whose sum is σ = 307947744. Its totient is φ = 31513440.

The previous prime is 121329977. The next prime is 121330031. The reversal of 121329978 is 879923121.

It is a super-2 number, since 2×121329978² = 29441927122960968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (121329977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15525 + ... + 21992.

It is an arithmetic number, because the mean of its divisors is an integer number (6415578).

Almost surely, 2^121329978 is an apocalyptic number.

121329978 is an abundant number, since it is smaller than the sum of its proper divisors (186617766).

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

121329978 is a wasteful number, since it uses less digits than its factorization.

121329978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37547 (or 37540 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 121329978 is about 11014.9887880106. The cubic root of 121329978 is about 495.0579505666.

The spelling of 121329978 in words is "one hundred twenty-one million, three hundred twenty-nine thousand, nine hundred seventy-eight".