121402624 has 72 divisors (see below), whose sum is σ = 284590208. Its totient is φ = 50595840.

The previous prime is 121402607. The next prime is 121402643. The reversal of 121402624 is 426204121.

It is a happy number.

It is a super-2 number, since 2×121402624² = 29477194228170752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121402595 and 121402604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65389 + ... + 67219.

Almost surely, 2^121402624 is an apocalyptic number.

121402624 is a gapful number since it is divisible by the number (14) 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 121402624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142295104).

121402624 is an abundant number, since it is smaller than the sum of its proper divisors (163187584).

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

121402624 is an equidigital number, since it uses as much as digits as its factorization.

121402624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891 (or 1877 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 121402624 is about 11018.2858920977. The cubic root of 121402624 is about 495.1567357283.

Adding to 121402624 its reverse (426204121), we get a palindrome (547606745).

The spelling of 121402624 in words is "one hundred twenty-one million, four hundred two thousand, six hundred twenty-four".