42396021 has 16 divisors (see below), whose sum is σ = 64147200. Its totient is φ = 27661824.

The previous prime is 42396007. The next prime is 42396023. The reversal of 42396021 is 12069324.

It is not a de Polignac number, because 42396021 - 2⁵ = 42395989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42396023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15436 + ... + 17973.

It is an arithmetic number, because the mean of its divisors is an integer number (4009200).

Almost surely, 2^42396021 is an apocalyptic number.

It is an amenable number.

42396021 is a deficient number, since it is larger than the sum of its proper divisors (21751179).

42396021 is a wasteful number, since it uses less digits than its factorization.

42396021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33465 (or 33459 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 42396021 is about 6511.2226962376. Note that the first 3 decimals coincide. The cubic root of 42396021 is about 348.6917719875.

The spelling of 42396021 in words is "forty-two million, three hundred ninety-six thousand, twenty-one".