21202120111210 has 8 divisors (see below), whose sum is σ = 38163816200196. Its totient is φ = 8480848044480.

The previous prime is 21202120111181. The next prime is 21202120111217. The reversal of 21202120111210 is 1211102120212.

It can be written as a sum of positive squares in 2 ways, for example, as 21174897421161 + 27222690049 = 4601619^2 + 164993^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21202120111217) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1060106005551 + ... + 1060106005570.

Almost surely, 2^{21202120111210} is an apocalyptic number.

21202120111210 is a deficient number, since it is larger than the sum of its proper divisors (16961696088986).

21202120111210 is a wasteful number, since it uses less digits than its factorization.

21202120111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120212011128.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21202120111210 its reverse (1211102120212), we get a palindrome (22413222231422).

The spelling of 21202120111210 in words is "twenty-one trillion, two hundred two billion, one hundred twenty million, one hundred eleven thousand, two hundred ten".