31421212320 has 192 divisors, whose sum is σ = 102658752000. Its totient is φ = 8068816896.

The previous prime is 31421212279. The next prime is 31421212331. The reversal of 31421212320 is 2321212413.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5690521 + ... + 5696039.

It is an arithmetic number, because the mean of its divisors is an integer number (534681000).

Almost surely, 2^31421212320 is an apocalyptic number.

31421212320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31421212320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51329376000).

31421212320 is an abundant number, since it is smaller than the sum of its proper divisors (71237539680).

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

31421212320 is a wasteful number, since it uses less digits than its factorization.

31421212320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5975 (or 5967 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31421212320 its reverse (2321212413), we get a palindrome (33742424733).

The spelling of 31421212320 in words is "thirty-one billion, four hundred twenty-one million, two hundred twelve thousand, three hundred twenty".