121436021 has 32 divisors (see below), whose sum is σ = 154828800. Its totient is φ = 92917440.

The previous prime is 121436017. The next prime is 121436023. The reversal of 121436021 is 120634121.

It is not a de Polignac number, because 121436021 - 2² = 121436017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121435984 and 121436002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121436023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144320 + ... + 145158.

It is an arithmetic number, because the mean of its divisors is an integer number (4838400).

Almost surely, 2^121436021 is an apocalyptic number.

It is an amenable number.

121436021 is a deficient number, since it is larger than the sum of its proper divisors (33392779).

121436021 is a wasteful number, since it uses less digits than its factorization.

121436021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 121436021 is about 11019.8013139984. The cubic root of 121436021 is about 495.2021362664.

The spelling of 121436021 in words is "one hundred twenty-one million, four hundred thirty-six thousand, twenty-one".