2121134441421 has 16 divisors (see below), whose sum is σ = 2879577217088. Its totient is φ = 1388471846400.

The previous prime is 2121134441401. The next prime is 2121134441431. The reversal of 2121134441421 is 1241444311212.

It is not a de Polignac number, because 2121134441421 - 2⁶ = 2121134441357 is a prime.

It is a super-2 number, since 2×2121134441421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121134441401) 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, 10045156 + ... + 10254141.

It is an arithmetic number, because the mean of its divisors is an integer number (179973576068).

Almost surely, 2^{2121134441421} is an apocalyptic number.

It is an amenable number.

2121134441421 is a deficient number, since it is larger than the sum of its proper divisors (758442775667).

2121134441421 is a wasteful number, since it uses less digits than its factorization.

2121134441421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20299932.

The product of its digits is 6144, while the sum is 30.

Adding to 2121134441421 its reverse (1241444311212), we get a palindrome (3362578752633).

The spelling of 2121134441421 in words is "two trillion, one hundred twenty-one billion, one hundred thirty-four million, four hundred forty-one thousand, four hundred twenty-one".