21295420 has 12 divisors (see below), whose sum is σ = 44720424. Its totient is φ = 8518160.

The previous prime is 21295411. The next prime is 21295459. The reversal of 21295420 is 2459212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532366 + ... + 532405.

It is an arithmetic number, because the mean of its divisors is an integer number (3726702).

Almost surely, 2^21295420 is an apocalyptic number.

21295420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21295420 is an abundant number, since it is smaller than the sum of its proper divisors (23425004).

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

21295420 is a wasteful number, since it uses less digits than its factorization.

21295420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064780 (or 1064778 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21295420 is about 4614.6960896683. The cubic root of 21295420 is about 277.1801145828.

The spelling of 21295420 in words is "twenty-one million, two hundred ninety-five thousand, four hundred twenty".