2101122120021 has 8 divisors (see below), whose sum is σ = 2801505890784. Its totient is φ = 1400743214640.

The previous prime is 2101122120017. The next prime is 2101122120023. The reversal of 2101122120021 is 1200212211012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101122120021 - 2² = 2101122120017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101122120023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48510 + ... + 2050511.

It is an arithmetic number, because the mean of its divisors is an integer number (350188236348).

Almost surely, 2^{2101122120021} is an apocalyptic number.

It is an amenable number.

2101122120021 is a deficient number, since it is larger than the sum of its proper divisors (700383770763).

2101122120021 is a wasteful number, since it uses less digits than its factorization.

2101122120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432691.

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

Adding to 2101122120021 its reverse (1200212211012), we get a palindrome (3301334331033).

Subtracting from 2101122120021 its reverse (1200212211012), we obtain a palindrome (900909909009).

The spelling of 2101122120021 in words is "two trillion, one hundred one billion, one hundred twenty-two million, one hundred twenty thousand, twenty-one".