21020012102212 has 6 divisors (see below), whose sum is σ = 36785021178878. Its totient is φ = 10510006051104.

The previous prime is 21020012102087. The next prime is 21020012102239. The reversal of 21020012102212 is 21220121002012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14562955028736 + 6457057073476 = 3816144^2 + 2541074^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627501512773 + ... + 2627501512780.

Almost surely, 2^{21020012102212} is an apocalyptic number.

It is an amenable number.

21020012102212 is a deficient number, since it is larger than the sum of its proper divisors (15765009076666).

21020012102212 is a wasteful number, since it uses less digits than its factorization.

21020012102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255003025557 (or 5255003025555 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020012102212 its reverse (21220121002012), we get a palindrome (42240133104224).

The spelling of 21020012102212 in words is "twenty-one trillion, twenty billion, twelve million, one hundred two thousand, two hundred twelve".