1231023042040 has 128 divisors (see below), whose sum is σ = 3201063261120. Its totient is φ = 421086208000.

The previous prime is 1231023041993. The next prime is 1231023042049. The reversal of 1231023042040 is 402403201321.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231023042049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14176194 + ... + 14262766.

Almost surely, 2^{1231023042040} is an apocalyptic number.

1231023042040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231023042040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1600531630560).

1231023042040 is an abundant number, since it is smaller than the sum of its proper divisors (1970040219080).

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

1231023042040 is a wasteful number, since it uses less digits than its factorization.

1231023042040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88513 (or 88509 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 1231023042040 its reverse (402403201321), we get a palindrome (1633426243361).

The spelling of 1231023042040 in words is "one trillion, two hundred thirty-one billion, twenty-three million, forty-two thousand, forty".