21425202 has 32 divisors (see below), whose sum is σ = 50414400. Its totient is φ = 6721344.

The previous prime is 21425189. The next prime is 21425203. The reversal of 21425202 is 20252412.

21425202 is a `hidden beast` number, since 2 + 142 + 520 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21425203) 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, 10752 + ... + 12587.

It is an arithmetic number, because the mean of its divisors is an integer number (1575450).

Almost surely, 2^21425202 is an apocalyptic number.

21425202 is an abundant number, since it is smaller than the sum of its proper divisors (28989198).

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

21425202 is a wasteful number, since it uses less digits than its factorization.

21425202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23367 (or 23361 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 21425202 is about 4628.7365446739. The cubic root of 21425202 is about 277.7420532309.

Adding to 21425202 its reverse (20252412), we get a palindrome (41677614).

The spelling of 21425202 in words is "twenty-one million, four hundred twenty-five thousand, two hundred two".