2121011221220 has 24 divisors (see below), whose sum is σ = 4463785457208. Its totient is φ = 846564128000.

The previous prime is 2121011221157. The next prime is 2121011221249. The reversal of 2121011221220 is 221221101212.

It can be written as a sum of positive squares in 4 ways, for example, as 778186816 + 2120233034404 = 27896^2 + 1456102^2 .

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, 115013081 + ... + 115031520.

It is an arithmetic number, because the mean of its divisors is an integer number (185991060717).

Almost surely, 2^{2121011221220} is an apocalyptic number.

2121011221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121011221220 is an abundant number, since it is smaller than the sum of its proper divisors (2342774235988).

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

2121011221220 is a wasteful number, since it uses less digits than its factorization.

2121011221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230045071 (or 230045069 counting only the distinct ones).

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

Adding to 2121011221220 its reverse (221221101212), we get a palindrome (2342232322432).

The spelling of 2121011221220 in words is "two trillion, one hundred twenty-one billion, eleven million, two hundred twenty-one thousand, two hundred twenty".