21362913 has 48 divisors (see below), whose sum is σ = 37537920. Its totient is φ = 11927520.

The previous prime is 21362909. The next prime is 21362917. The reversal of 21362913 is 31926312.

21362913 is a `hidden beast` number, since 21 + 3 + 629 + 13 = 666.

It is an interprime number because it is at equal distance from previous prime (21362909) and next prime (21362917).

It is not a de Polignac number, because 21362913 - 2² = 21362909 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (21362917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42220 + ... + 42722.

It is an arithmetic number, because the mean of its divisors is an integer number (782040).

Almost surely, 2^21362913 is an apocalyptic number.

It is an amenable number.

21362913 is a deficient number, since it is larger than the sum of its proper divisors (16175007).

21362913 is a wasteful number, since it uses less digits than its factorization.

21362913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 530 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 21362913 is about 4622.0031371690. The cubic root of 21362913 is about 277.4726342627.

The spelling of 21362913 in words is "twenty-one million, three hundred sixty-two thousand, nine hundred thirteen".