121201111431 has 32 divisors (see below), whose sum is σ = 190145594880. Its totient is φ = 76037275008.

The previous prime is 121201111411. The next prime is 121201111433. The reversal of 121201111431 is 134111102121.

121201111431 is a `hidden beast` number, since 1 + 2 + 120 + 1 + 111 + 431 = 666.

It is not a de Polignac number, because 121201111431 - 2¹³ = 121201103239 is a prime.

It is a super-2 number, since 2×121201111431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201111433) 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, 4580020 + ... + 4606406.

It is an arithmetic number, because the mean of its divisors is an integer number (5942049840).

Almost surely, 2^121201111431 is an apocalyptic number.

121201111431 is a deficient number, since it is larger than the sum of its proper divisors (68944483449).

121201111431 is a wasteful number, since it uses less digits than its factorization.

121201111431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36420 (or 36414 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 121201111431 its reverse (134111102121), we get a palindrome (255312213552).

The spelling of 121201111431 in words is "one hundred twenty-one billion, two hundred one million, one hundred eleven thousand, four hundred thirty-one".