21021020202 has 64 divisors (see below), whose sum is σ = 52621148160. Its totient is φ = 5450030784.

The previous prime is 21021020161. The next prime is 21021020239. The reversal of 21021020202 is 20202012012.

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, 294058 + ... + 358485.

It is an arithmetic number, because the mean of its divisors is an integer number (822205440).

Almost surely, 2^21021020202 is an apocalyptic number.

21021020202 is an abundant number, since it is smaller than the sum of its proper divisors (31600127958).

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

21021020202 is a wasteful number, since it uses less digits than its factorization.

21021020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652627.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21021020202 its reverse (20202012012), we get a palindrome (41223032214).

The spelling of 21021020202 in words is "twenty-one billion, twenty-one million, twenty thousand, two hundred two".