21625773 has 16 divisors (see below), whose sum is σ = 32403840. Its totient is φ = 12729024.

The previous prime is 21625771. The next prime is 21625787. The reversal of 21625773 is 37752612.

It is not a de Polignac number, because 21625773 - 2¹ = 21625771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21625771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11158 + ... + 12951.

It is an arithmetic number, because the mean of its divisors is an integer number (2025240).

Almost surely, 2^21625773 is an apocalyptic number.

21625773 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21625773 is a deficient number, since it is larger than the sum of its proper divisors (10778067).

21625773 is a wasteful number, since it uses less digits than its factorization.

21625773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24148.

The product of its digits is 17640, while the sum is 33.

The square root of 21625773 is about 4650.3519221668. The cubic root of 21625773 is about 278.6060523509.

The spelling of 21625773 in words is "twenty-one million, six hundred twenty-five thousand, seven hundred seventy-three".