21472425 has 48 divisors (see below), whose sum is σ = 42497280. Its totient is φ = 10566720.

The previous prime is 21472417. The next prime is 21472433. The reversal of 21472425 is 52427412.

It is an interprime number because it is at equal distance from previous prime (21472417) and next prime (21472433).

It is not a de Polignac number, because 21472425 - 2³ = 21472417 is a prime.

It is a super-2 number, since 2×21472425² = 922130070761250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7552 + ... + 9998.

It is an arithmetic number, because the mean of its divisors is an integer number (885360).

Almost surely, 2^21472425 is an apocalyptic number.

21472425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21472425 is a deficient number, since it is larger than the sum of its proper divisors (21024855).

21472425 is a wasteful number, since it uses less digits than its factorization.

21472425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479 (or 2468 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 21472425 is about 4633.8348049968. The cubic root of 21472425 is about 277.9459593385.

Adding to 21472425 its reverse (52427412), we get a palindrome (73899837).

The spelling of 21472425 in words is "twenty-one million, four hundred seventy-two thousand, four hundred twenty-five".