121404040023 has 32 divisors (see below), whose sum is σ = 206188208640. Its totient is φ = 61856455680.

The previous prime is 121404040019. The next prime is 121404040039. The reversal of 121404040023 is 320040404121.

It is not a de Polignac number, because 121404040023 - 2² = 121404040019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121404040063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8942358 + ... + 8955923.

It is an arithmetic number, because the mean of its divisors is an integer number (6443381520).

Almost surely, 2^121404040023 is an apocalyptic number.

121404040023 is a deficient number, since it is larger than the sum of its proper divisors (84784168617).

121404040023 is a wasteful number, since it uses less digits than its factorization.

121404040023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17898327.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 121404040023 its reverse (320040404121), we get a palindrome (441444444144).

The spelling of 121404040023 in words is "one hundred twenty-one billion, four hundred four million, forty thousand, twenty-three".