21472451 has 32 divisors (see below), whose sum is σ = 30374400. Its totient is φ = 14618880.

The previous prime is 21472433. The next prime is 21472453. The reversal of 21472451 is 15427412.

It is a cyclic number.

It is not a de Polignac number, because 21472451 - 2¹⁴ = 21456067 is a prime.

It is a super-2 number, since 2×21472451² = 922132303894802, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21472451.

It is not an unprimeable number, because it can be changed into a prime (21472453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18455 + ... + 19583.

It is an arithmetic number, because the mean of its divisors is an integer number (949200).

Almost surely, 2^21472451 is an apocalyptic number.

21472451 is a deficient number, since it is larger than the sum of its proper divisors (8901949).

21472451 is a wasteful number, since it uses less digits than its factorization.

21472451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179.

The product of its digits is 2240, while the sum is 26.

The square root of 21472451 is about 4633.8376104477. The cubic root of 21472451 is about 277.9460715226.

Adding to 21472451 its reverse (15427412), we get a palindrome (36899863).

The spelling of 21472451 in words is "twenty-one million, four hundred seventy-two thousand, four hundred fifty-one".