2121201211220 has 96 divisors (see below), whose sum is σ = 5515319351808. Its totient is φ = 667305211392.

The previous prime is 2121201211219. The next prime is 2121201211249. The reversal of 2121201211220 is 221121021212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3185567 + ... + 3793446.

It is an arithmetic number, because the mean of its divisors is an integer number (57451243248).

Almost surely, 2^{2121201211220} is an apocalyptic number.

2121201211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121201211220 is an abundant number, since it is smaller than the sum of its proper divisors (3394118140588).

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

2121201211220 is a wasteful number, since it uses less digits than its factorization.

2121201211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6979209 (or 6979207 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2121201211220 its reverse (221121021212), we get a palindrome (2342322232432).

The spelling of 2121201211220 in words is "two trillion, one hundred twenty-one billion, two hundred one million, two hundred eleven thousand, two hundred twenty".