2101231232121 has 16 divisors (see below), whose sum is σ = 3202172131328. Its totient is φ = 1200592573200.

The previous prime is 2101231232083. The next prime is 2101231232153. The reversal of 2101231232121 is 1212321321012.

It is not a de Polignac number, because 2101231232121 - 2¹⁰ = 2101231231097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101231232161) 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, 4391635 + ... + 4846536.

It is an arithmetic number, because the mean of its divisors is an integer number (200135758208).

Almost surely, 2^{2101231232121} is an apocalyptic number.

2101231232121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2101231232121 is a deficient number, since it is larger than the sum of its proper divisors (1100940899207).

2101231232121 is a wasteful number, since it uses less digits than its factorization.

2101231232121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9249012.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 2101231232121 its reverse (1212321321012), we get a palindrome (3313552553133).

The spelling of 2101231232121 in words is "two trillion, one hundred one billion, two hundred thirty-one million, two hundred thirty-two thousand, one hundred twenty-one".