42153921 has 24 divisors (see below), whose sum is σ = 63011520. Its totient is φ = 27140256.

The previous prime is 42153887. The next prime is 42153929. The reversal of 42153921 is 12935124.

It is not a de Polignac number, because 42153921 - 2¹⁰ = 42152897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42153929) 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, 31300 + ... + 32618.

It is an arithmetic number, because the mean of its divisors is an integer number (2625480).

Almost surely, 2^42153921 is an apocalyptic number.

It is an amenable number.

42153921 is a deficient number, since it is larger than the sum of its proper divisors (20857599).

42153921 is a wasteful number, since it uses less digits than its factorization.

42153921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445 (or 1442 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 42153921 is about 6492.6051011901. The cubic root of 42153921 is about 348.0267765762.

The spelling of 42153921 in words is "forty-two million, one hundred fifty-three thousand, nine hundred twenty-one".