21020202212 has 6 divisors (see below), whose sum is σ = 36785353878. Its totient is φ = 10510101104.

The previous prime is 21020202179. The next prime is 21020202233. The reversal of 21020202212 is 21220202012.

It can be written as a sum of positive squares in only one way, i.e., 16257270016 + 4762932196 = 127504^2 + 69014^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627525273 + ... + 2627525280.

It is an arithmetic number, because the mean of its divisors is an integer number (6130892313).

Almost surely, 2^21020202212 is an apocalyptic number.

It is an amenable number.

21020202212 is a deficient number, since it is larger than the sum of its proper divisors (15765151666).

21020202212 is a wasteful number, since it uses less digits than its factorization.

21020202212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255050557 (or 5255050555 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21020202212 its reverse (21220202012), we get a palindrome (42240404224).

The spelling of 21020202212 in words is "twenty-one billion, twenty million, two hundred two thousand, two hundred twelve".