2143431122021 has 4 divisors (see below), whose sum is σ = 2449635568032. Its totient is φ = 1837226676012.

The previous prime is 2143431121987. The next prime is 2143431122039. The reversal of 2143431122021 is 1202211343412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2143431122021 - 2⁶ = 2143431121957 is a prime.

It is a super-2 number, since 2×2143431122021² (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 (2143431122081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153102222995 + ... + 153102223008.

It is an arithmetic number, because the mean of its divisors is an integer number (612408892008).

Almost surely, 2^{2143431122021} is an apocalyptic number.

It is an amenable number.

2143431122021 is a deficient number, since it is larger than the sum of its proper divisors (306204446011).

2143431122021 is an equidigital number, since it uses as much as digits as its factorization.

2143431122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306204446010.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 2143431122021 its reverse (1202211343412), we get a palindrome (3345642465433).

The spelling of 2143431122021 in words is "two trillion, one hundred forty-three billion, four hundred thirty-one million, one hundred twenty-two thousand, twenty-one".