40123431343121 has 32 divisors (see below), whose sum is σ = 48624695377920. Its totient is φ = 32320512711936.

The previous prime is 40123431343103. The next prime is 40123431343123. The reversal of 40123431343121 is 12134313432104.

It is a cyclic number.

It is not a de Polignac number, because 40123431343121 - 2³⁸ = 39848553436177 is a prime.

It is a super-2 number, since 2×40123431343121² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40123431343123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 807889136 + ... + 807938798.

It is an arithmetic number, because the mean of its divisors is an integer number (1519521730560).

Almost surely, 2^{40123431343121} is an apocalyptic number.

It is an amenable number.

40123431343121 is a deficient number, since it is larger than the sum of its proper divisors (8501264034799).

40123431343121 is a wasteful number, since it uses less digits than its factorization.

40123431343121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59613.

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 40123431343121 its reverse (12134313432104), we get a palindrome (52257744775225).

The spelling of 40123431343121 in words is "forty trillion, one hundred twenty-three billion, four hundred thirty-one million, three hundred forty-three thousand, one hundred twenty-one".