21464503 has 2 divisors, whose sum is σ = 21464504. Its totient is φ = 21464502.

The previous prime is 21464501. The next prime is 21464539. The reversal of 21464503 is 30546412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21464503 - 2¹ = 21464501 is a prime.

Together with 21464501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21464501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732251 + 10732252.

It is an arithmetic number, because the mean of its divisors is an integer number (10732252).

Almost surely, 2^21464503 is an apocalyptic number.

21464503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464503 is an equidigital number, since it uses as much as digits as its factorization.

21464503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21464503 is about 4632.9799265699. The cubic root of 21464503 is about 277.9117734973.

The spelling of 21464503 in words is "twenty-one million, four hundred sixty-four thousand, five hundred three".