2123131221001 has 24 divisors (see below), whose sum is σ = 2545547727744. Its totient is φ = 1734508332480.

The previous prime is 2123131220921. The next prime is 2123131221031. The reversal of 2123131221001 is 1001221313212.

It is not a de Polignac number, because 2123131221001 - 2⁹ = 2123131220489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2123131221001.

It is not an unprimeable number, because it can be changed into a prime (2123131221031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20340 + ... + 2060746.

It is an arithmetic number, because the mean of its divisors is an integer number (106064488656).

Almost surely, 2^{2123131221001} is an apocalyptic number.

It is an amenable number.

2123131221001 is a deficient number, since it is larger than the sum of its proper divisors (422416506743).

2123131221001 is a wasteful number, since it uses less digits than its factorization.

2123131221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040741 (or 2040718 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2123131221001 its reverse (1001221313212), we get a palindrome (3124352534213).

The spelling of 2123131221001 in words is "two trillion, one hundred twenty-three billion, one hundred thirty-one million, two hundred twenty-one thousand, one".