21367953 has 12 divisors (see below), whose sum is σ = 30950400. Its totient is φ = 14205816.

The previous prime is 21367933. The next prime is 21367979. The reversal of 21367953 is 35976312.

It is not a de Polignac number, because 21367953 - 2⁶ = 21367889 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21367933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 348 + ... + 6546.

It is an arithmetic number, because the mean of its divisors is an integer number (2579200).

Almost surely, 2^21367953 is an apocalyptic number.

It is an amenable number.

21367953 is a deficient number, since it is larger than the sum of its proper divisors (9582447).

21367953 is a wasteful number, since it uses less digits than its factorization.

21367953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6588 (or 6585 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 21367953 is about 4622.5483231655. The cubic root of 21367953 is about 277.4944532614.

The spelling of 21367953 in words is "twenty-one million, three hundred sixty-seven thousand, nine hundred fifty-three".