21952385 has 16 divisors (see below), whose sum is σ = 32422656. Its totient is φ = 13894848.

The previous prime is 21952339. The next prime is 21952387. The reversal of 21952385 is 58325912.

21952385 = T₅₄ + T₅₅ + ... + T₅₀₈.

It is a cyclic number.

It is not a de Polignac number, because 21952385 - 2⁸ = 21952129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21952387) 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, 23669 + ... + 24578.

It is an arithmetic number, because the mean of its divisors is an integer number (2026416).

Almost surely, 2^21952385 is an apocalyptic number.

It is an amenable number.

21952385 is a deficient number, since it is larger than the sum of its proper divisors (10470271).

21952385 is a wasteful number, since it uses less digits than its factorization.

21952385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48272.

The product of its digits is 21600, while the sum is 35.

The square root of 21952385 is about 4685.3372343941. The cubic root of 21952385 is about 280.0016368952.

The spelling of 21952385 in words is "twenty-one million, nine hundred fifty-two thousand, three hundred eighty-five".