42312921 has 24 divisors (see below), whose sum is σ = 66878784. Its totient is φ = 23718240.

The previous prime is 42312901. The next prime is 42312929. The reversal of 42312921 is 12921324.

It is not a de Polignac number, because 42312921 - 2⁶ = 42312857 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42312891 and 42312900.

It is not an unprimeable number, because it can be changed into a prime (42312929) 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, 5076 + ... + 10506.

It is an arithmetic number, because the mean of its divisors is an integer number (2786616).

Almost surely, 2^42312921 is an apocalyptic number.

It is an amenable number.

42312921 is a deficient number, since it is larger than the sum of its proper divisors (24565863).

42312921 is a wasteful number, since it uses less digits than its factorization.

42312921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5501 (or 5494 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 42312921 is about 6504.8382762372. The cubic root of 42312921 is about 348.4638006021.

The spelling of 42312921 in words is "forty-two million, three hundred twelve thousand, nine hundred twenty-one".