21495404 has 24 divisors (see below), whose sum is σ = 43118880. Its totient is φ = 9184896.

The previous prime is 21495401. The next prime is 21495407. The reversal of 21495404 is 40459412.

It is an interprime number because it is at equal distance from previous prime (21495401) and next prime (21495407).

It is not an unprimeable number, because it can be changed into a prime (21495401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10514 + ... + 12390.

It is an arithmetic number, because the mean of its divisors is an integer number (1796620).

Almost surely, 2^21495404 is an apocalyptic number.

It is an amenable number.

21495404 is an abundant number, since it is smaller than the sum of its proper divisors (21623476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21495404 is a wasteful number, since it uses less digits than its factorization.

21495404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297 (or 2295 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21495404 is about 4636.3136218336. The cubic root of 21495404 is about 278.0450731741.

The spelling of 21495404 in words is "twenty-one million, four hundred ninety-five thousand, four hundred four".