21210120121210 has 16 divisors (see below), whose sum is σ = 39066081712416. Its totient is φ = 8286744605328.

The previous prime is 21210120121193. The next prime is 21210120121297. The reversal of 21210120121210 is 1212102101212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24662929944 + ... + 24662930803.

It is an arithmetic number, because the mean of its divisors is an integer number (2441630107026).

Almost surely, 2^{21210120121210} is an apocalyptic number.

21210120121210 is a deficient number, since it is larger than the sum of its proper divisors (17855961591206).

21210120121210 is a wasteful number, since it uses less digits than its factorization.

21210120121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49325860797.

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

Adding to 21210120121210 its reverse (1212102101212), we get a palindrome (22422222222422).

The spelling of 21210120121210 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, one hundred twenty-one thousand, two hundred ten".