21676425 has 12 divisors (see below), whose sum is σ = 35838480. Its totient is φ = 11560720.

The previous prime is 21676387. The next prime is 21676469. The reversal of 21676425 is 52467612.

It is not a de Polignac number, because 21676425 - 2⁷ = 21676297 is a prime.

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, 144435 + ... + 144584.

It is an arithmetic number, because the mean of its divisors is an integer number (2986540).

Almost surely, 2^21676425 is an apocalyptic number.

21676425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21676425 is a deficient number, since it is larger than the sum of its proper divisors (14162055).

21676425 is a wasteful number, since it uses less digits than its factorization.

21676425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289032 (or 289027 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 21676425 is about 4655.7947764050. The cubic root of 21676425 is about 278.8234002715.

The spelling of 21676425 in words is "twenty-one million, six hundred seventy-six thousand, four hundred twenty-five".