21396502 has 8 divisors (see below), whose sum is σ = 32192712. Its totient is φ = 10665600.

The previous prime is 21396497. The next prime is 21396503. The reversal of 21396502 is 20569312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21396503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15499 + ... + 16822.

It is an arithmetic number, because the mean of its divisors is an integer number (4024089).

Almost surely, 2^21396502 is an apocalyptic number.

21396502 is a deficient number, since it is larger than the sum of its proper divisors (10796210).

21396502 is a wasteful number, since it uses less digits than its factorization.

21396502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32654.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 21396502 is about 4625.6353077172. The cubic root of 21396502 is about 277.6179819178.

The spelling of 21396502 in words is "twenty-one million, three hundred ninety-six thousand, five hundred two".