21419725 has 6 divisors (see below), whose sum is σ = 26560490. Its totient is φ = 17135760.

The previous prime is 21419701. The next prime is 21419731. The reversal of 21419725 is 52791412.

It can be written as a sum of positive squares in 3 ways, for example, as 158404 + 21261321 = 398^2 + 4611^2 .

It is not a de Polignac number, because 21419725 - 2⁷ = 21419597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 428370 + ... + 428419.

Almost surely, 2^21419725 is an apocalyptic number.

21419725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21419725 is a deficient number, since it is larger than the sum of its proper divisors (5140765).

21419725 is an equidigital number, since it uses as much as digits as its factorization.

21419725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856799 (or 856794 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The square root of 21419725 is about 4628.1448767298. The cubic root of 21419725 is about 277.7183844869.

The spelling of 21419725 in words is "twenty-one million, four hundred nineteen thousand, seven hundred twenty-five".