2140956476821 has 4 divisors (see below), whose sum is σ = 2176054124044. Its totient is φ = 2105858829600.

The previous prime is 2140956476689. The next prime is 2140956476837. The reversal of 2140956476821 is 1286746590412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 749592324100 + 1391364152721 = 865790^2 + 1179561^2 .

It is a cyclic number.

It is not a de Polignac number, because 2140956476821 - 2²⁵ = 2140922922389 is a prime.

It is a super-2 number, since 2×2140956476821² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2140956476881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17548823520 + ... + 17548823641.

It is an arithmetic number, because the mean of its divisors is an integer number (544013531011).

Almost surely, 2^{2140956476821} is an apocalyptic number.

It is an amenable number.

2140956476821 is a deficient number, since it is larger than the sum of its proper divisors (35097647223).

2140956476821 is an equidigital number, since it uses as much as digits as its factorization.

2140956476821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35097647222.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 2140956476821 in words is "two trillion, one hundred forty billion, nine hundred fifty-six million, four hundred seventy-six thousand, eight hundred twenty-one".