31344343403021 has 4 divisors (see below), whose sum is σ = 34193829166944. Its totient is φ = 28494857639100.

The previous prime is 31344343402987. The next prime is 31344343403029. The reversal of 31344343403021 is 12030434344313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31344343403021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31344343403029) 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, 1424742881945 + ... + 1424742881966.

It is an arithmetic number, because the mean of its divisors is an integer number (8548457291736).

Almost surely, 2^{31344343403021} is an apocalyptic number.

It is an amenable number.

31344343403021 is a deficient number, since it is larger than the sum of its proper divisors (2849485763923).

31344343403021 is a wasteful number, since it uses less digits than its factorization.

31344343403021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2849485763922.

The product of its (nonzero) digits is 124416, while the sum is 35.

Adding to 31344343403021 its reverse (12030434344313), we get a palindrome (43374777747334).

The spelling of 31344343403021 in words is "thirty-one trillion, three hundred forty-four billion, three hundred forty-three million, four hundred three thousand, twenty-one".