121455620 has 48 divisors (see below), whose sum is σ = 299654208. Its totient is φ = 40767360.

The previous prime is 121455611. The next prime is 121455623. The reversal of 121455620 is 26554121.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 121455620.

It is not an unprimeable number, because it can be changed into a prime (121455623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18374 + ... + 24093.

It is an arithmetic number, because the mean of its divisors is an integer number (6242796).

Almost surely, 2^121455620 is an apocalyptic number.

121455620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121455620 is an abundant number, since it is smaller than the sum of its proper divisors (178198588).

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

121455620 is a wasteful number, since it uses less digits than its factorization.

121455620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42500 (or 42498 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 121455620 is about 11020.6905409779. The cubic root of 121455620 is about 495.2287756564.

The spelling of 121455620 in words is "one hundred twenty-one million, four hundred fifty-five thousand, six hundred twenty".