21465402 has 64 divisors (see below), whose sum is σ = 53114880. Its totient is φ = 5645376.

The previous prime is 21465397. The next prime is 21465443. The reversal of 21465402 is 20456412.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29163 + ... + 29889.

It is an arithmetic number, because the mean of its divisors is an integer number (829920).

Almost surely, 2^21465402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21465402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26557440).

21465402 is an abundant number, since it is smaller than the sum of its proper divisors (31649478).

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

21465402 is a wasteful number, since it uses less digits than its factorization.

21465402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 21465402 is about 4633.0769473429. The cubic root of 21465402 is about 277.9156533790.

The spelling of 21465402 in words is "twenty-one million, four hundred sixty-five thousand, four hundred two".