31000200121 has 24 divisors (see below), whose sum is σ = 34738395552. Its totient is φ = 27638001600.

The previous prime is 31000200109. The next prime is 31000200173. The reversal of 31000200121 is 12100200013.

It is not a de Polignac number, because 31000200121 - 2¹⁷ = 31000069049 is a prime.

It is a super-2 number, since 2×31000200121² (a number of 22 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 = 31000200098 and 31000200107.

It is not an unprimeable number, because it can be changed into a prime (31000200181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1364626 + ... + 1387156.

It is an arithmetic number, because the mean of its divisors is an integer number (1447433148).

Almost surely, 2^31000200121 is an apocalyptic number.

It is an amenable number.

31000200121 is a deficient number, since it is larger than the sum of its proper divisors (3738195431).

31000200121 is a wasteful number, since it uses less digits than its factorization.

31000200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22773 (or 22762 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 31000200121 its reverse (12100200013), we get a palindrome (43100400134).

The spelling of 31000200121 in words is "thirty-one billion, two hundred thousand, one hundred twenty-one".