21725354 has 16 divisors (see below), whose sum is σ = 39434688. Its totient is φ = 8763072.

The previous prime is 21725351. The next prime is 21725369. The reversal of 21725354 is 45352712.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21725351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45404 + ... + 45879.

It is an arithmetic number, because the mean of its divisors is an integer number (2464668).

Almost surely, 2^21725354 is an apocalyptic number.

21725354 is a deficient number, since it is larger than the sum of its proper divisors (17709334).

21725354 is a wasteful number, since it uses less digits than its factorization.

21725354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91309.

The product of its digits is 8400, while the sum is 29.

The square root of 21725354 is about 4661.0464490284. The cubic root of 21725354 is about 279.0330335197.

The spelling of 21725354 in words is "twenty-one million, seven hundred twenty-five thousand, three hundred fifty-four".