21053727 has 6 divisors (see below), whose sum is σ = 30410952. Its totient is φ = 14035812.

The previous prime is 21053713. The next prime is 21053731. The reversal of 21053727 is 72735012.

It is not a de Polignac number, because 21053727 - 2⁶ = 21053663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21053727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21053707) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1169643 + ... + 1169660.

It is an arithmetic number, because the mean of its divisors is an integer number (5068492).

Almost surely, 2^21053727 is an apocalyptic number.

21053727 is a deficient number, since it is larger than the sum of its proper divisors (9357225).

21053727 is a wasteful number, since it uses less digits than its factorization.

21053727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339309 (or 2339306 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 21053727 is about 4588.4340466002. The cubic root of 21053727 is about 276.1275009520.

Adding to 21053727 its reverse (72735012), we get a palindrome (93788739).

It can be divided in two parts, 2105 and 3727, that added together give a cube (5832 = 18³).

The spelling of 21053727 in words is "twenty-one million, fifty-three thousand, seven hundred twenty-seven".