231000021031200 has 144 divisors (see below), whose sum is σ = 752128013601216. Its totient is φ = 61581740774400.

The previous prime is 231000021031189. The next prime is 231000021031217. The reversal of 231000021031200 is 2130120000132.

It is a super-2 number, since 2×231000021031200² (a number of 30 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 231000021031200.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6172516 + ... + 22362915.

It is an arithmetic number, because the mean of its divisors is an integer number (5223111205564).

Almost surely, 2^{231000021031200} is an apocalyptic number.

231000021031200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231000021031200 is an abundant number, since it is smaller than the sum of its proper divisors (521127992570016).

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

231000021031200 is a wasteful number, since it uses less digits than its factorization.

231000021031200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28538827 (or 28538814 counting only the distinct ones).

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

Adding to 231000021031200 its reverse (2130120000132), we get a palindrome (233130141031332).

The spelling of 231000021031200 in words is "two hundred thirty-one trillion, twenty-one million, thirty-one thousand, two hundred".