121653423 has 24 divisors (see below), whose sum is σ = 178492496. Its totient is φ = 79833600.

The previous prime is 121653419. The next prime is 121653451. The reversal of 121653423 is 324356121.

121653423 is a `hidden beast` number, since 1 + 2 + 1 + 653 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 121653423 - 2² = 121653419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121653023) 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, 288753 + ... + 289173.

Almost surely, 2^121653423 is an apocalyptic number.

121653423 is a deficient number, since it is larger than the sum of its proper divisors (56839073).

121653423 is a wasteful number, since it uses less digits than its factorization.

121653423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855 (or 852 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 121653423 is about 11029.6610555357. The cubic root of 121653423 is about 495.4974735492.

The spelling of 121653423 in words is "one hundred twenty-one million, six hundred fifty-three thousand, four hundred twenty-three".