400121212144111 has 4 divisors (see below), whose sum is σ = 400143454711000. Its totient is φ = 400098969577224.

The previous prime is 400121212144057. The next prime is 400121212144153. The reversal of 400121212144111 is 111441212121004.

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

It is a cyclic number.

It is not a de Polignac number, because 400121212144111 - 2⁴³ = 391325119121903 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 (400121212144211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11121256461 + ... + 11121292438.

It is an arithmetic number, because the mean of its divisors is an integer number (100035863677750).

Almost surely, 2^{400121212144111} is an apocalyptic number.

400121212144111 is a deficient number, since it is larger than the sum of its proper divisors (22242566889).

400121212144111 is a wasteful number, since it uses less digits than its factorization.

400121212144111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22242566888.

The product of its (nonzero) digits is 512, while the sum is 25.

Adding to 400121212144111 its reverse (111441212121004), we get a palindrome (511562424265115).

The spelling of 400121212144111 in words is "four hundred trillion, one hundred twenty-one billion, two hundred twelve million, one hundred forty-four thousand, one hundred eleven".