21679053 has 16 divisors (see below), whose sum is σ = 31752000. Its totient is φ = 13047680.

The previous prime is 21679051. The next prime is 21679081. The reversal of 21679053 is 35097612.

It is a cyclic number.

It is not a de Polignac number, because 21679053 - 2¹ = 21679051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21679051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2713 + ... + 7121.

It is an arithmetic number, because the mean of its divisors is an integer number (1984500).

Almost surely, 2^21679053 is an apocalyptic number.

It is an amenable number.

21679053 is a deficient number, since it is larger than the sum of its proper divisors (10072947).

21679053 is a wasteful number, since it uses less digits than its factorization.

21679053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 21679053 is about 4656.0769967860. The cubic root of 21679053 is about 278.8346677858.

The spelling of 21679053 in words is "twenty-one million, six hundred seventy-nine thousand, fifty-three".