2121010101220 has 24 divisors (see below), whose sum is σ = 4469860168704. Its totient is φ = 845406144096.

The previous prime is 2121010101209. The next prime is 2121010101257. The reversal of 2121010101220 is 221010101212.

It is a self number, because there is not a number n which added to its sum of digits gives 2121010101220.

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, 187362724 + ... + 187374043.

It is an arithmetic number, because the mean of its divisors is an integer number (186244173696).

Almost surely, 2^{2121010101220} is an apocalyptic number.

2121010101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121010101220 is an abundant number, since it is smaller than the sum of its proper divisors (2348850067484).

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

2121010101220 is a wasteful number, since it uses less digits than its factorization.

2121010101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374737059 (or 374737057 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2121010101220 its reverse (221010101212), we get a palindrome (2342020202432).

The spelling of 2121010101220 in words is "two trillion, one hundred twenty-one billion, ten million, one hundred one thousand, two hundred twenty".