140021231204021 has 4 divisors (see below), whose sum is σ = 140021266121772. Its totient is φ = 140021196286272.

The previous prime is 140021231204011. The next prime is 140021231204093. The reversal of 140021231204021 is 120402132120041.

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 40322004701521 + 99699226502500 = 6349961^2 + 9984950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140021231204021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140021231204011) 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, 10526210 + ... + 19769763.

It is an arithmetic number, because the mean of its divisors is an integer number (35005316530443).

Almost surely, 2^{140021231204021} is an apocalyptic number.

It is an amenable number.

140021231204021 is a deficient number, since it is larger than the sum of its proper divisors (34917751).

140021231204021 is an equidigital number, since it uses as much as digits as its factorization.

140021231204021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34917750.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 140021231204021 its reverse (120402132120041), we get a palindrome (260423363324062).

The spelling of 140021231204021 in words is "one hundred forty trillion, twenty-one billion, two hundred thirty-one million, two hundred four thousand, twenty-one".