21211120011210 has 64 divisors (see below), whose sum is σ = 51053370660864. Its totient is φ = 5640022958400.

The previous prime is 21211120011203. The next prime is 21211120011217. The reversal of 21211120011210 is 1211002111212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21211120011203) and next prime (21211120011217).

It is a super-2 number, since 2×21211120011210² (a number of 27 digits) contains 22 as substring.

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 21211120011210.

It is not an unprimeable number, because it can be changed into a prime (21211120011217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14496315 + ... + 15892305.

It is an arithmetic number, because the mean of its divisors is an integer number (797708916576).

Almost surely, 2^{21211120011210} is an apocalyptic number.

21211120011210 is an abundant number, since it is smaller than the sum of its proper divisors (29842250649654).

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

21211120011210 is a wasteful number, since it uses less digits than its factorization.

21211120011210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397459.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21211120011210 its reverse (1211002111212), we get a palindrome (22422122122422).

The spelling of 21211120011210 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty million, eleven thousand, two hundred ten".