40121621604431 has 4 divisors (see below), whose sum is σ = 40188379710864. Its totient is φ = 40054863498000.

The previous prime is 40121621604401. The next prime is 40121621604523. The reversal of 40121621604431 is 13440612612104.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40121621604431 is a prime.

It is a super-2 number, since 2×40121621604431² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40121621604391 and 40121621604400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121621604401) 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, 33379052315 + ... + 33379053516.

It is an arithmetic number, because the mean of its divisors is an integer number (10047094927716).

Almost surely, 2^{40121621604431} is an apocalyptic number.

40121621604431 is a deficient number, since it is larger than the sum of its proper divisors (66758106433).

40121621604431 is an equidigital number, since it uses as much as digits as its factorization.

40121621604431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66758106432.

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 40121621604431 in words is "forty trillion, one hundred twenty-one billion, six hundred twenty-one million, six hundred four thousand, four hundred thirty-one".