31121230200 has 96 divisors (see below), whose sum is σ = 102150894960. Its totient is φ = 7810816000.

The previous prime is 31121230193. The next prime is 31121230207. The reversal of 31121230200 is 203212113.

It is an interprime number because it is at equal distance from previous prime (31121230193) and next prime (31121230207).

It is a super-2 number, since 2×31121230200² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31121230200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121230207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1515351 + ... + 1535750.

Almost surely, 2^31121230200 is an apocalyptic number.

31121230200 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31121230200 is an abundant number, since it is smaller than the sum of its proper divisors (71029664760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31121230200 is a wasteful number, since it uses less digits than its factorization.

31121230200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051137 (or 3051128 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31121230200 its reverse (203212113), we get a palindrome (31324442313).

The spelling of 31121230200 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty thousand, two hundred".