31121100201 has 16 divisors (see below), whose sum is σ = 43946705088. Its totient is φ = 19522060800.

The previous prime is 31121100181. The next prime is 31121100203. The reversal of 31121100201 is 10200112113.

It is not a de Polignac number, because 31121100201 - 2¹⁵ = 31121067433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31121100203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134061 + ... + 283221.

It is an arithmetic number, because the mean of its divisors is an integer number (2746669068).

Almost surely, 2^31121100201 is an apocalyptic number.

It is an amenable number.

31121100201 is a deficient number, since it is larger than the sum of its proper divisors (12825604887).

31121100201 is a wasteful number, since it uses less digits than its factorization.

31121100201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153272.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 31121100201 its reverse (10200112113), we get a palindrome (41321212314).

The spelling of 31121100201 in words is "thirty-one billion, one hundred twenty-one million, one hundred thousand, two hundred one".