1021155113231 has 16 divisors (see below), whose sum is σ = 1130938960128. Its totient is φ = 914204491200.

The previous prime is 1021155113203. The next prime is 1021155113273. The reversal of 1021155113231 is 1323115511201.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1021155113231 is a prime.

It is a super-2 number, since 2×1021155113231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021155113231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021155113731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2390291 + ... + 2784923.

It is an arithmetic number, because the mean of its divisors is an integer number (70683685008).

Almost surely, 2^{1021155113231} is an apocalyptic number.

1021155113231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1021155113231 is a deficient number, since it is larger than the sum of its proper divisors (109783846897).

1021155113231 is a wasteful number, since it uses less digits than its factorization.

1021155113231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398222.

The product of its (nonzero) digits is 900, while the sum is 26.

The spelling of 1021155113231 in words is "one trillion, twenty-one billion, one hundred fifty-five million, one hundred thirteen thousand, two hundred thirty-one".