21210120202210 has 8 divisors (see below), whose sum is σ = 38178216363996. Its totient is φ = 8484048080880.

The previous prime is 21210120202207. The next prime is 21210120202237. The reversal of 21210120202210 is 1220202101212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20201941547649 + 1008178654561 = 4494657^2 + 1004081^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060506010101 + ... + 1060506010120.

Almost surely, 2^{21210120202210} is an apocalyptic number.

21210120202210 is a deficient number, since it is larger than the sum of its proper divisors (16968096161786).

21210120202210 is a wasteful number, since it uses less digits than its factorization.

21210120202210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121012020228.

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

Adding to 21210120202210 its reverse (1220202101212), we get a palindrome (22430322303422).

The spelling of 21210120202210 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, two hundred two thousand, two hundred ten".