21210021021210 has 32 divisors (see below), whose sum is σ = 58176057658752. Its totient is φ = 4848004804800.

The previous prime is 21210021021197. The next prime is 21210021021263. The reversal of 21210021021210 is 1212012001212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21210021021210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50500049841 + ... + 50500050260.

It is an arithmetic number, because the mean of its divisors is an integer number (1818001801836).

Almost surely, 2^{21210021021210} is an apocalyptic number.

21210021021210 is an abundant number, since it is smaller than the sum of its proper divisors (36966036637542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210021021210 is a wasteful number, since it uses less digits than its factorization.

21210021021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101000100118.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210021021210 its reverse (1212012001212), we get a palindrome (22422033022422).

The spelling of 21210021021210 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, twenty-one thousand, two hundred ten".