2101220212121 has 16 divisors (see below), whose sum is σ = 2199928713600. Its totient is φ = 2003126336640.

The previous prime is 2101220212111. The next prime is 2101220212123. The reversal of 2101220212121 is 1212120221012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101220212121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2101220212121.

It is not an unprimeable number, because it can be changed into a prime (2101220212123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54844430 + ... + 54882728.

It is an arithmetic number, because the mean of its divisors is an integer number (137495544600).

Almost surely, 2^{2101220212121} is an apocalyptic number.

It is an amenable number.

2101220212121 is a deficient number, since it is larger than the sum of its proper divisors (98708501479).

2101220212121 is a wasteful number, since it uses less digits than its factorization.

2101220212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46256.

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

Adding to 2101220212121 its reverse (1212120221012), we get a palindrome (3313340433133).

The spelling of 2101220212121 in words is "two trillion, one hundred one billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-one".