1231211231000 has 32 divisors (see below), whose sum is σ = 2881034282880. Its totient is φ = 492484492000.

The previous prime is 1231211230993. The next prime is 1231211231023. The reversal of 1231211231000 is 1321121321.

It is a super-2 number, since 2×1231211231000² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1231211231000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615604616 + ... + 615606615.

It is an arithmetic number, because the mean of its divisors is an integer number (90032321340).

Almost surely, 2^{1231211231000} is an apocalyptic number.

1231211231000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231211231000 is an abundant number, since it is smaller than the sum of its proper divisors (1649823051880).

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

1231211231000 is a wasteful number, since it uses less digits than its factorization.

1231211231000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231211252 (or 1231211238 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1231211231000 its reverse (1321121321), we get a palindrome (1232532352321).

The spelling of 1231211231000 in words is "one trillion, two hundred thirty-one billion, two hundred eleven million, two hundred thirty-one thousand".