21368053 has 8 divisors (see below), whose sum is σ = 24597440. Its totient is φ = 18182880.

The previous prime is 21368047. The next prime is 21368059. The reversal of 21368053 is 35086312.

It is an interprime number because it is at equal distance from previous prime (21368047) and next prime (21368059).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21368053 - 2¹³ = 21359861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21368059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10008 + ... + 11953.

It is an arithmetic number, because the mean of its divisors is an integer number (3074680).

Almost surely, 2^21368053 is an apocalyptic number.

It is an amenable number.

21368053 is a deficient number, since it is larger than the sum of its proper divisors (3229387).

21368053 is a wasteful number, since it uses less digits than its factorization.

21368053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22107.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 21368053 is about 4622.5591396974. The cubic root of 21368053 is about 277.4948861433.

The spelling of 21368053 in words is "twenty-one million, three hundred sixty-eight thousand, fifty-three".