31440314021 has 2 divisors, whose sum is σ = 31440314022. Its totient is φ = 31440314020.

The previous prime is 31440313969. The next prime is 31440314039. The reversal of 31440314021 is 12041304413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24426251521 + 7014062500 = 156289^2 + 83750^2 .

It is a cyclic number.

It is not a de Polignac number, because 31440314021 - 2³⁴ = 14260444837 is a prime.

It is a super-3 number, since 3×31440314021³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31440314041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15720157010 + 15720157011.

It is an arithmetic number, because the mean of its divisors is an integer number (15720157011).

Almost surely, 2^31440314021 is an apocalyptic number.

It is an amenable number.

31440314021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31440314021 is an equidigital number, since it uses as much as digits as its factorization.

31440314021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31440314021 its reverse (12041304413), we get a palindrome (43481618434).

The spelling of 31440314021 in words is "thirty-one billion, four hundred forty million, three hundred fourteen thousand, twenty-one".