21719125 has 16 divisors (see below), whose sum is σ = 27256320. Its totient is φ = 17278800.

The previous prime is 21719099. The next prime is 21719129. The reversal of 21719125 is 52191712.

It is not a de Polignac number, because 21719125 - 2⁷ = 21718997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21719093 and 21719102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21719129) 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, 29512 + ... + 30238.

It is an arithmetic number, because the mean of its divisors is an integer number (1703520).

Almost surely, 2^21719125 is an apocalyptic number.

21719125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21719125 is a deficient number, since it is larger than the sum of its proper divisors (5537195).

21719125 is an equidigital number, since it uses as much as digits as its factorization.

21719125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981 (or 971 counting only the distinct ones).

The product of its digits is 1260, while the sum is 28.

The square root of 21719125 is about 4660.3782035367. The cubic root of 21719125 is about 279.0063632538.

The spelling of 21719125 in words is "twenty-one million, seven hundred nineteen thousand, one hundred twenty-five".