121005561031 has 4 divisors (see below), whose sum is σ = 121039872912. Its totient is φ = 120971249152.

The previous prime is 121005561013. The next prime is 121005561071. The reversal of 121005561031 is 130165500121.

It is a happy number.

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 121005561031 - 2⁵ = 121005560999 is a prime.

It is a super-2 number, since 2×121005561031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121005560987 and 121005561005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121005561071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17150650 + ... + 17157703.

It is an arithmetic number, because the mean of its divisors is an integer number (30259968228).

Almost surely, 2^121005561031 is an apocalyptic number.

121005561031 is a deficient number, since it is larger than the sum of its proper divisors (34311881).

121005561031 is an equidigital number, since it uses as much as digits as its factorization.

121005561031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34311880.

The product of its (nonzero) digits is 900, while the sum is 25.

The spelling of 121005561031 in words is "one hundred twenty-one billion, five million, five hundred sixty-one thousand, thirty-one".