21472463 has 2 divisors, whose sum is σ = 21472464. Its totient is φ = 21472462.

The previous prime is 21472457. The next prime is 21472481. The reversal of 21472463 is 36427412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21472463 is a prime.

It is a super-2 number, since 2×21472463² = 922133334572738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21472403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10736231 + 10736232.

It is an arithmetic number, because the mean of its divisors is an integer number (10736232).

Almost surely, 2^21472463 is an apocalyptic number.

21472463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21472463 is an equidigital number, since it uses as much as digits as its factorization.

21472463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 29.

The square root of 21472463 is about 4633.8389052707. The cubic root of 21472463 is about 277.9461232998.

Adding to 21472463 its reverse (36427412), we get a palindrome (57899875).

The spelling of 21472463 in words is "twenty-one million, four hundred seventy-two thousand, four hundred sixty-three".