2101111122021 has 16 divisors (see below), whose sum is σ = 2849327704704. Its totient is φ = 1377016176384.

The previous prime is 2101111121987. The next prime is 2101111122023. The reversal of 2101111122021 is 1202211111012.

It is a happy number.

It is not a de Polignac number, because 2101111122021 - 2⁶ = 2101111121957 is a prime.

It is a super-2 number, since 2×2101111122021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101111122023) 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, 24774136 + ... + 24858801.

It is an arithmetic number, because the mean of its divisors is an integer number (178082981544).

Almost surely, 2^{2101111122021} is an apocalyptic number.

It is an amenable number.

2101111122021 is a deficient number, since it is larger than the sum of its proper divisors (748216582683).

2101111122021 is a wasteful number, since it uses less digits than its factorization.

2101111122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49633180.

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

Adding to 2101111122021 its reverse (1202211111012), we get a palindrome (3303322233033).

The spelling of 2101111122021 in words is "two trillion, one hundred one billion, one hundred eleven million, one hundred twenty-two thousand, twenty-one".