111142021431 has 16 divisors (see below), whose sum is σ = 172815584000. Its totient is φ = 63509725944.

The previous prime is 111142021421. The next prime is 111142021433. The reversal of 111142021431 is 134120241111.

It is not a de Polignac number, because 111142021431 - 2¹³ = 111142013239 is a prime.

It is a super-2 number, since 2×111142021431² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111142021398 and 111142021407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111142021433) 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, 54003841 + ... + 54005898.

It is an arithmetic number, because the mean of its divisors is an integer number (10800974000).

Almost surely, 2^111142021431 is an apocalyptic number.

111142021431 is a deficient number, since it is larger than the sum of its proper divisors (61673562569).

111142021431 is an equidigital number, since it uses as much as digits as its factorization.

111142021431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108009763 (or 108009749 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 111142021431 its reverse (134120241111), we get a palindrome (245262262542).

The spelling of 111142021431 in words is "one hundred eleven billion, one hundred forty-two million, twenty-one thousand, four hundred thirty-one".