31230321431440 has 80 divisors (see below), whose sum is σ = 73248223688640. Its totient is φ = 12382629742080.

The previous prime is 31230321431357. The next prime is 31230321431473. The reversal of 31230321431440 is 4413412303213.

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

It is a super-2 number, since 2×31230321431440² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7491991 + ... + 10889929.

It is an arithmetic number, because the mean of its divisors is an integer number (915602796108).

Almost surely, 2^{31230321431440} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31230321431440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36624111844320).

31230321431440 is an abundant number, since it is smaller than the sum of its proper divisors (42017902257200).

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

31230321431440 is a wasteful number, since it uses less digits than its factorization.

31230321431440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398960 (or 3398954 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 31230321431440 its reverse (4413412303213), we get a palindrome (35643733734653).

The spelling of 31230321431440 in words is "thirty-one trillion, two hundred thirty billion, three hundred twenty-one million, four hundred thirty-one thousand, four hundred forty".