121257620 has 48 divisors (see below), whose sum is σ = 292420800. Its totient is φ = 41771520.

The previous prime is 121257611. The next prime is 121257641. The reversal of 121257620 is 26752121.

It is a self number, because there is not a number n which added to its sum of digits gives 121257620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10325 + ... + 18684.

It is an arithmetic number, because the mean of its divisors is an integer number (6092100).

Almost surely, 2^121257620 is an apocalyptic number.

121257620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121257620 is an abundant number, since it is smaller than the sum of its proper divisors (171163180).

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

121257620 is a wasteful number, since it uses less digits than its factorization.

121257620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29048 (or 29046 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 121257620 is about 11011.7037737128. The cubic root of 121257620 is about 494.9595178267.

The spelling of 121257620 in words is "one hundred twenty-one million, two hundred fifty-seven thousand, six hundred twenty".