21111211202 has 16 divisors (see below), whose sum is σ = 32266976280. Its totient is φ = 10357051392.

The previous prime is 21111211151. The next prime is 21111211207. The reversal of 21111211202 is 20211211112.

It can be written as a sum of positive squares in 4 ways, for example, as 18378953761 + 2732257441 = 135569^2 + 52271^2 .

It is not an unprimeable number, because it can be changed into a prime (21111211207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346427 + ... + 402782.

Almost surely, 2^21111211202 is an apocalyptic number.

21111211202 is a deficient number, since it is larger than the sum of its proper divisors (11155765078).

21111211202 is a wasteful number, since it uses less digits than its factorization.

21111211202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749477.

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

Adding to 21111211202 its reverse (20211211112), we get a palindrome (41322422314).

The spelling of 21111211202 in words is "twenty-one billion, one hundred eleven million, two hundred eleven thousand, two hundred two".