21425711 has 6 divisors (see below), whose sum is σ = 22613112. Its totient is φ = 20297700.

The previous prime is 21425707. The next prime is 21425759. The reversal of 21425711 is 11752412.

It is not a de Polignac number, because 21425711 - 2² = 21425707 is a prime.

It is a super-2 number, since 2×21425711² = 918122183711042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29315 + ... + 30036.

It is an arithmetic number, because the mean of its divisors is an integer number (3768852).

Almost surely, 2^21425711 is an apocalyptic number.

21425711 is a deficient number, since it is larger than the sum of its proper divisors (1187401).

21425711 is an equidigital number, since it uses as much as digits as its factorization.

21425711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59389 (or 59370 counting only the distinct ones).

The product of its digits is 560, while the sum is 23.

The square root of 21425711 is about 4628.7915269539. The cubic root of 21425711 is about 277.7442526592.

The spelling of 21425711 in words is "twenty-one million, four hundred twenty-five thousand, seven hundred eleven".