21472753 has 4 divisors (see below), whose sum is σ = 21744640. Its totient is φ = 21200868.

The previous prime is 21472747. The next prime is 21472757. The reversal of 21472753 is 35727412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21472753 - 2⁵ = 21472721 is a prime.

It is a super-2 number, since 2×21472753² = 922158242798018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21472757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135825 + ... + 135982.

It is an arithmetic number, because the mean of its divisors is an integer number (5436160).

Almost surely, 2^21472753 is an apocalyptic number.

It is an amenable number.

21472753 is a deficient number, since it is larger than the sum of its proper divisors (271887).

21472753 is an equidigital number, since it uses as much as digits as its factorization.

21472753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271886.

The product of its digits is 11760, while the sum is 31.

The square root of 21472753 is about 4633.8701967146. The cubic root of 21472753 is about 277.9473745770.

It can be divided in two parts, 2147 and 2753, that added together give a square (4900 = 70²).

The spelling of 21472753 in words is "twenty-one million, four hundred seventy-two thousand, seven hundred fifty-three".