40205133123421 has 16 divisors (see below), whose sum is σ = 46280347747200. Its totient is φ = 34212835879488.

The previous prime is 40205133123391. The next prime is 40205133123457. The reversal of 40205133123421 is 12432133150204.

It is not a de Polignac number, because 40205133123421 - 2²³ = 40205124734813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40205133123521) 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, 44298051 + ... + 45196543.

It is an arithmetic number, because the mean of its divisors is an integer number (2892521734200).

Almost surely, 2^{40205133123421} is an apocalyptic number.

It is an amenable number.

40205133123421 is a deficient number, since it is larger than the sum of its proper divisors (6075214623779).

40205133123421 is a wasteful number, since it uses less digits than its factorization.

40205133123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944628.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 40205133123421 its reverse (12432133150204), we get a palindrome (52637266273625).

The spelling of 40205133123421 in words is "forty trillion, two hundred five billion, one hundred thirty-three million, one hundred twenty-three thousand, four hundred twenty-one".