31121101000019 has 4 divisors (see below), whose sum is σ = 31121227227600. Its totient is φ = 31120974772440.

The previous prime is 31121100999973. The next prime is 31121101000039. The reversal of 31121101000019 is 91000010112113.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31121101000019 is a prime.

It is a super-2 number, since 2×31121101000019² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121101000039) 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, 62743244 + ... + 63237305.

It is an arithmetic number, because the mean of its divisors is an integer number (7780306806900).

Almost surely, 2^{31121101000019} is an apocalyptic number.

31121101000019 is a deficient number, since it is larger than the sum of its proper divisors (126227581).

31121101000019 is a wasteful number, since it uses less digits than its factorization.

31121101000019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126227580.

The product of its (nonzero) digits is 54, while the sum is 20.

The spelling of 31121101000019 in words is "thirty-one trillion, one hundred twenty-one billion, one hundred one million, nineteen", and thus it is an aban number.