21754373 has 16 divisors (see below), whose sum is σ = 24779520. Its totient is φ = 18971136.

The previous prime is 21754363. The next prime is 21754387. The reversal of 21754373 is 37345712.

It is a cyclic number.

It is not a de Polignac number, because 21754373 - 2⁴ = 21754357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21754363) 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, 14465 + ... + 15897.

It is an arithmetic number, because the mean of its divisors is an integer number (1548720).

Almost surely, 2^21754373 is an apocalyptic number.

It is an amenable number.

21754373 is a deficient number, since it is larger than the sum of its proper divisors (3025147).

21754373 is a wasteful number, since it uses less digits than its factorization.

21754373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516.

The product of its digits is 17640, while the sum is 32.

The square root of 21754373 is about 4664.1583377926. The cubic root of 21754373 is about 279.1572149568.

The spelling of 21754373 in words is "twenty-one million, seven hundred fifty-four thousand, three hundred seventy-three".