21325402 has 16 divisors (see below), whose sum is σ = 36617472. Its totient is φ = 9124560.

The previous prime is 21325397. The next prime is 21325433. The reversal of 21325402 is 20452312.

It is a self number, because there is not a number n which added to its sum of digits gives 21325402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14752 + ... + 16132.

It is an arithmetic number, because the mean of its divisors is an integer number (2288592).

Almost surely, 2^21325402 is an apocalyptic number.

21325402 is a deficient number, since it is larger than the sum of its proper divisors (15292070).

21325402 is a wasteful number, since it uses less digits than its factorization.

21325402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21325402 is about 4617.9434816810. The cubic root of 21325402 is about 277.3101349838.

Adding to 21325402 its reverse (20452312), we get a palindrome (41777714).

The spelling of 21325402 in words is "twenty-one million, three hundred twenty-five thousand, four hundred two".