1231111135320 has 64 divisors (see below), whose sum is σ = 4029090992640. Its totient is φ = 298451184000.

The previous prime is 1231111135307. The next prime is 1231111135333. The reversal of 1231111135320 is 235311111321.

It is an interprime number because it is at equal distance from previous prime (1231111135307) and next prime (1231111135333).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 466328656 + ... + 466331295.

It is an arithmetic number, because the mean of its divisors is an integer number (62954546760).

Almost surely, 2^{1231111135320} is an apocalyptic number.

1231111135320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231111135320 is an abundant number, since it is smaller than the sum of its proper divisors (2797979857320).

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

1231111135320 is a wasteful number, since it uses less digits than its factorization.

1231111135320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932659976 (or 932659972 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

Adding to 1231111135320 its reverse (235311111321), we get a palindrome (1466422246641).

The spelling of 1231111135320 in words is "one trillion, two hundred thirty-one billion, one hundred eleven million, one hundred thirty-five thousand, three hundred twenty".