21462625 has 16 divisors (see below), whose sum is σ = 27061632. Its totient is φ = 16993200.

The previous prime is 21462613. The next prime is 21462629. The reversal of 21462625 is 52626412.

It is not a de Polignac number, because 21462625 - 2⁵ = 21462593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21462593 and 21462602.

It is not an unprimeable number, because it can be changed into a prime (21462629) 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, 12042 + ... + 13708.

It is an arithmetic number, because the mean of its divisors is an integer number (1691352).

Almost surely, 2^21462625 is an apocalyptic number.

21462625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21462625 is a deficient number, since it is larger than the sum of its proper divisors (5599007).

21462625 is a wasteful number, since it uses less digits than its factorization.

21462625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785 (or 1775 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 21462625 is about 4632.7772448068. Note that the first 3 decimals coincide. The cubic root of 21462625 is about 277.9036681224.

The spelling of 21462625 in words is "twenty-one million, four hundred sixty-two thousand, six hundred twenty-five".