121405123415121 has 64 divisors (see below), whose sum is σ = 200758780164096. Its totient is φ = 63546170688000.

The previous prime is 121405123415113. The next prime is 121405123415153. The reversal of 121405123415121 is 121514321504121.

It is a happy number.

It is not a de Polignac number, because 121405123415121 - 2³ = 121405123415113 is a prime.

It is a super-2 number, since 2×121405123415121² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121405123415101) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 966146146 + ... + 966271796.

It is an arithmetic number, because the mean of its divisors is an integer number (3136855940064).

Almost surely, 2^{121405123415121} is an apocalyptic number.

It is an amenable number.

121405123415121 is a deficient number, since it is larger than the sum of its proper divisors (79353656748975).

121405123415121 is a wasteful number, since it uses less digits than its factorization.

121405123415121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152822.

The product of its (nonzero) digits is 9600, while the sum is 33.

Adding to 121405123415121 its reverse (121514321504121), we get a palindrome (242919444919242).

The spelling of 121405123415121 in words is "one hundred twenty-one trillion, four hundred five billion, one hundred twenty-three million, four hundred fifteen thousand, one hundred twenty-one".