21740325 has 12 divisors (see below), whose sum is σ = 35944128. Its totient is φ = 11594800.

The previous prime is 21740317. The next prime is 21740347. The reversal of 21740325 is 52304712.

It is not a de Polignac number, because 21740325 - 2³ = 21740317 is a prime.

It is a super-2 number, since 2×21740325² = 945283462211250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21740295 and 21740304.

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, 144861 + ... + 145010.

It is an arithmetic number, because the mean of its divisors is an integer number (2995344).

Almost surely, 2^21740325 is an apocalyptic number.

21740325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21740325 is a deficient number, since it is larger than the sum of its proper divisors (14203803).

21740325 is a wasteful number, since it uses less digits than its factorization.

21740325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289884 (or 289879 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21740325 is about 4662.6521422898. The cubic root of 21740325 is about 279.0971129413.

The spelling of 21740325 in words is "twenty-one million, seven hundred forty thousand, three hundred twenty-five".