21011020202 has 16 divisors (see below), whose sum is σ = 33062515200. Its totient is φ = 10000386480.

The previous prime is 21011020183. The next prime is 21011020243. The reversal of 21011020202 is 20202011012.

It is a happy number.

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, 2547002 + ... + 2555237.

It is an arithmetic number, because the mean of its divisors is an integer number (2066407200).

Almost surely, 2^21011020202 is an apocalyptic number.

21011020202 is a deficient number, since it is larger than the sum of its proper divisors (12051494998).

21011020202 is a wasteful number, since it uses less digits than its factorization.

21011020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5102341.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21011020202 its reverse (20202011012), we get a palindrome (41213031214).

The spelling of 21011020202 in words is "twenty-one billion, eleven million, twenty thousand, two hundred two".