31421443440 has 80 divisors (see below), whose sum is σ = 97426326816. Its totient is φ = 8377344000.

The previous prime is 31421443433. The next prime is 31421443441. The reversal of 31421443440 is 4434412413.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31421443398 and 31421443407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421443441) 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, 1545340 + ... + 1565540.

Almost surely, 2^31421443440 is an apocalyptic number.

31421443440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31421443440 is an abundant number, since it is smaller than the sum of its proper divisors (66004883376).

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

31421443440 is a wasteful number, since it uses less digits than its factorization.

31421443440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26698 (or 26692 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 31421443440 its reverse (4434412413), we get a palindrome (35855855853).

The spelling of 31421443440 in words is "thirty-one billion, four hundred twenty-one million, four hundred forty-three thousand, four hundred forty".