21021110010212 has 24 divisors (see below), whose sum is σ = 39618252970296. Its totient is φ = 9701672249088.

The previous prime is 21021110010163. The next prime is 21021110010223. The reversal of 21021110010212 is 21201001112012.

It can be written as a sum of positive squares in 4 ways, for example, as 1694412476416 + 19326697533796 = 1301696^2 + 4396214^2 .

It is a super-2 number, since 2×21021110010212² (a number of 27 digits) contains 22 as substring.

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, 6538103 + ... + 9208094.

It is an arithmetic number, because the mean of its divisors is an integer number (1650760540429).

Almost surely, 2^{21021110010212} is an apocalyptic number.

It is an amenable number.

21021110010212 is a deficient number, since it is larger than the sum of its proper divisors (18597142960084).

21021110010212 is a wasteful number, since it uses less digits than its factorization.

21021110010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15771887 (or 15771885 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21021110010212 its reverse (21201001112012), we get a palindrome (42222111122224).

The spelling of 21021110010212 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, ten thousand, two hundred twelve".