21302542 has 16 divisors (see below), whose sum is σ = 32645232. Its totient is φ = 10422720.

The previous prime is 21302539. The next prime is 21302551. The reversal of 21302542 is 24520312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34218 + ... + 34834.

It is an arithmetic number, because the mean of its divisors is an integer number (2040327).

Almost surely, 2^21302542 is an apocalyptic number.

21302542 is a deficient number, since it is larger than the sum of its proper divisors (11342690).

21302542 is a wasteful number, since it uses less digits than its factorization.

21302542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21302542 is about 4615.4676902780. The cubic root of 21302542 is about 277.2110110032.

Adding to 21302542 its reverse (24520312), we get a palindrome (45822854).

The spelling of 21302542 in words is "twenty-one million, three hundred two thousand, five hundred forty-two".