21472663 has 2 divisors, whose sum is σ = 21472664. Its totient is φ = 21472662.

The previous prime is 21472657. The next prime is 21472667. The reversal of 21472663 is 36627412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21472663 - 2⁵ = 21472631 is a prime.

It is a super-2 number, since 2×21472663² = 922150512623138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21472667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10736331 + 10736332.

It is an arithmetic number, because the mean of its divisors is an integer number (10736332).

Almost surely, 2^21472663 is an apocalyptic number.

21472663 is a deficient number, since it is larger than the sum of its proper divisors (1).

21472663 is an equidigital number, since it uses as much as digits as its factorization.

21472663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

The square root of 21472663 is about 4633.8604855995. The cubic root of 21472663 is about 277.9469862508.

The spelling of 21472663 in words is "twenty-one million, four hundred seventy-two thousand, six hundred sixty-three".