140121233436421 has 4 divisors (see below), whose sum is σ = 140122067118700. Its totient is φ = 140120399754144.

The previous prime is 140121233436413. The next prime is 140121233436449. The reversal of 140121233436421 is 124634332121041.

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 75699918324900 + 64421315111521 = 8700570^2 + 8026289^2 .

It is a cyclic number.

It is not a de Polignac number, because 140121233436421 - 2³ = 140121233436413 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 (140121233436451) 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, 416588976 + ... + 416925193.

It is an arithmetic number, because the mean of its divisors is an integer number (35030516779675).

Almost surely, 2^{140121233436421} is an apocalyptic number.

It is an amenable number.

140121233436421 is a deficient number, since it is larger than the sum of its proper divisors (833682279).

140121233436421 is an equidigital number, since it uses as much as digits as its factorization.

140121233436421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833682278.

The product of its (nonzero) digits is 82944, while the sum is 37.

Adding to 140121233436421 its reverse (124634332121041), we get a palindrome (264755565557462).

The spelling of 140121233436421 in words is "one hundred forty trillion, one hundred twenty-one billion, two hundred thirty-three million, four hundred thirty-six thousand, four hundred twenty-one".