21362013 has 36 divisors (see below), whose sum is σ = 33715968. Its totient is φ = 13023360.

The previous prime is 21361957. The next prime is 21362041. The reversal of 21362013 is 31026312.

It is not a de Polignac number, because 21362013 - 2¹⁴ = 21345629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21362113) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 111748 + ... + 111938.

Almost surely, 2^21362013 is an apocalyptic number.

It is an amenable number.

21362013 is a deficient number, since it is larger than the sum of its proper divisors (12353955).

21362013 is a wasteful number, since it uses less digits than its factorization.

21362013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 21362013 is about 4621.9057757596. The cubic root of 21362013 is about 277.4687376518.

Adding to 21362013 its reverse (31026312), we get a palindrome (52388325).

It can be divided in two parts, 213 and 62013, that added together give a palindrome (62226).

The spelling of 21362013 in words is "twenty-one million, three hundred sixty-two thousand, thirteen".