21953325 has 12 divisors (see below), whose sum is σ = 36296288. Its totient is φ = 11708400.

The previous prime is 21953311. The next prime is 21953333. The reversal of 21953325 is 52335912.

It is not a de Polignac number, because 21953325 - 2¹² = 21949229 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21953292 and 21953301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146281 + ... + 146430.

Almost surely, 2^21953325 is an apocalyptic number.

21953325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21953325 is a deficient number, since it is larger than the sum of its proper divisors (14342963).

21953325 is a wasteful number, since it uses less digits than its factorization.

21953325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292724 (or 292719 counting only the distinct ones).

The product of its digits is 8100, while the sum is 30.

The square root of 21953325 is about 4685.4375462704. The cubic root of 21953325 is about 280.0056333901.

The spelling of 21953325 in words is "twenty-one million, nine hundred fifty-three thousand, three hundred twenty-five".