21210022100210 has 8 divisors (see below), whose sum is σ = 38178039780396. Its totient is φ = 8484008840080.

The previous prime is 21210022100203. The next prime is 21210022100221. The reversal of 21210022100210 is 1200122001212.

It can be written as a sum of positive squares in 2 ways, for example, as 19929501277009 + 1280520823201 = 4464247^2 + 1131601^2 .

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, 1060501105001 + ... + 1060501105020.

Almost surely, 2^{21210022100210} is an apocalyptic number.

21210022100210 is a deficient number, since it is larger than the sum of its proper divisors (16968017680186).

21210022100210 is a wasteful number, since it uses less digits than its factorization.

21210022100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121002210028.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210022100210 its reverse (1200122001212), we get a palindrome (22410144101422).

The spelling of 21210022100210 in words is "twenty-one trillion, two hundred ten billion, twenty-two million, one hundred thousand, two hundred ten".