1031400044021 has 4 divisors (see below), whose sum is σ = 1031515512492. Its totient is φ = 1031284575552.

The previous prime is 1031400043997. The next prime is 1031400044027. The reversal of 1031400044021 is 1204400041301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 212257389796 + 819142654225 = 460714^2 + 905065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1031400044021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1031400043984 and 1031400044002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031400044027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57720836 + ... + 57738701.

It is an arithmetic number, because the mean of its divisors is an integer number (257878878123).

Almost surely, 2^{1031400044021} is an apocalyptic number.

It is an amenable number.

1031400044021 is a deficient number, since it is larger than the sum of its proper divisors (115468471).

1031400044021 is an equidigital number, since it uses as much as digits as its factorization.

1031400044021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115468470.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1031400044021 its reverse (1204400041301), we get a palindrome (2235800085322).

The spelling of 1031400044021 in words is "one trillion, thirty-one billion, four hundred million, forty-four thousand, twenty-one".