21537002 has 16 divisors (see below), whose sum is σ = 33460992. Its totient is φ = 10385760.

The previous prime is 21537001. The next prime is 21537029. The reversal of 21537002 is 20073512.

It is not an unprimeable number, because it can be changed into a prime (21537001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34598 + ... + 35214.

It is an arithmetic number, because the mean of its divisors is an integer number (2091312).

Almost surely, 2^21537002 is an apocalyptic number.

21537002 is a deficient number, since it is larger than the sum of its proper divisors (11923990).

21537002 is a wasteful number, since it uses less digits than its factorization.

21537002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 21537002 is about 4640.7975607647. The cubic root of 21537002 is about 278.2243156148.

The spelling of 21537002 in words is "twenty-one million, five hundred thirty-seven thousand, two".