21454825 has 12 divisors (see below), whose sum is σ = 30404800. Its totient is φ = 14711760.

The previous prime is 21454817. The next prime is 21454831. The reversal of 21454825 is 52845412.

It is not a de Polignac number, because 21454825 - 2³ = 21454817 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, 61125 + ... + 61474.

Almost surely, 2^21454825 is an apocalyptic number.

21454825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21454825 is a deficient number, since it is larger than the sum of its proper divisors (8949975).

21454825 is a wasteful number, since it uses less digits than its factorization.

21454825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122616 (or 122611 counting only the distinct ones).

The product of its digits is 12800, while the sum is 31.

The square root of 21454825 is about 4631.9353406541. The cubic root of 21454825 is about 277.8699985650.

The spelling of 21454825 in words is "twenty-one million, four hundred fifty-four thousand, eight hundred twenty-five".