21002212201210 has 16 divisors (see below), whose sum is σ = 40027745607336. Its totient is φ = 7906715181568.

The previous prime is 21002212201199. The next prime is 21002212201211. The reversal of 21002212201210 is 1210221220012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19449449483409 + 1552762717801 = 4410153^2 + 1246099^2 .

It is not an unprimeable number, because it can be changed into a prime (21002212201211) 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, 61771212187 + ... + 61771212526.

Almost surely, 2^{21002212201210} is an apocalyptic number.

21002212201210 is a deficient number, since it is larger than the sum of its proper divisors (19025533406126).

21002212201210 is a wasteful number, since it uses less digits than its factorization.

21002212201210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123542424737.

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

Adding to 21002212201210 its reverse (1210221220012), we get a palindrome (22212433421222).

It can be divided in two parts, 21002 and 212201210, that added together give a palindrome (212222212).

The spelling of 21002212201210 in words is "twenty-one trillion, two billion, two hundred twelve million, two hundred one thousand, two hundred ten".