2121201011220 has 96 divisors (see below), whose sum is σ = 6144411748608. Its totient is φ = 546348321792.

The previous prime is 2121201011219. The next prime is 2121201011239. The reversal of 2121201011220 is 221101021212.

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 2121201011220.

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, 3183072 + ... + 3791351.

It is an arithmetic number, because the mean of its divisors is an integer number (64004289048).

Almost surely, 2^{2121201011220} is an apocalyptic number.

2121201011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121201011220 is an abundant number, since it is smaller than the sum of its proper divisors (4023210737388).

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

2121201011220 is a wasteful number, since it uses less digits than its factorization.

2121201011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6974609 (or 6974607 counting only the distinct ones).

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

Adding to 2121201011220 its reverse (221101021212), we get a palindrome (2342302032432).

The spelling of 2121201011220 in words is "two trillion, one hundred twenty-one billion, two hundred one million, eleven thousand, two hundred twenty".