121100031 has 12 divisors (see below), whose sum is σ = 188378008. Its totient is φ = 74523024.

The previous prime is 121100029. The next prime is 121100039. The reversal of 121100031 is 130001121.

It is not a de Polignac number, because 121100031 - 2¹ = 121100029 is a prime.

It is a super-2 number, since 2×121100031² = 29330435016401922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 121099986 and 121100022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 517405 + ... + 517638.

Almost surely, 2^121100031 is an apocalyptic number.

121100031 is a deficient number, since it is larger than the sum of its proper divisors (67277977).

121100031 is a wasteful number, since it uses less digits than its factorization.

121100031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035062 (or 1035059 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 121100031 is about 11004.5459242987. The cubic root of 121100031 is about 494.7450048745.

Adding to 121100031 its reverse (130001121), we get a palindrome (251101152).

The spelling of 121100031 in words is "one hundred twenty-one million, one hundred thousand, thirty-one".