21620202 has 16 divisors (see below), whose sum is σ = 44295552. Its totient is φ = 7030880.

The previous prime is 21620197. The next prime is 21620227. The reversal of 21620202 is 20202612.

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, 43698 + ... + 44189.

It is an arithmetic number, because the mean of its divisors is an integer number (2768472).

Almost surely, 2^21620202 is an apocalyptic number.

21620202 is an abundant number, since it is smaller than the sum of its proper divisors (22675350).

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

21620202 is a wasteful number, since it uses less digits than its factorization.

21620202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87933.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21620202 is about 4649.7528966602. The cubic root of 21620202 is about 278.5821264606.

Adding to 21620202 its reverse (20202612), we get a palindrome (41822814).

The spelling of 21620202 in words is "twenty-one million, six hundred twenty thousand, two hundred two".