2101122111021 has 16 divisors (see below), whose sum is σ = 2806480291200. Its totient is φ = 1398256516800.

The previous prime is 2101122111013. The next prime is 2101122111029. The reversal of 2101122111021 is 1201112211012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2101122111013) and next prime (2101122111029).

It is not a de Polignac number, because 2101122111021 - 2³ = 2101122111013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101122111029) 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, 17733051 + ... + 17851143.

It is an arithmetic number, because the mean of its divisors is an integer number (175405018200).

Almost surely, 2^{2101122111021} is an apocalyptic number.

It is an amenable number.

2101122111021 is a deficient number, since it is larger than the sum of its proper divisors (705358180179).

2101122111021 is a wasteful number, since it uses less digits than its factorization.

2101122111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128596.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2101122111021 its reverse (1201112211012), we get a palindrome (3302234322033).

Subtracting from 2101122111021 its reverse (1201112211012), we obtain a palindrome (900009900009).

The spelling of 2101122111021 in words is "two trillion, one hundred one billion, one hundred twenty-two million, one hundred eleven thousand, twenty-one".