31421041520 has 320 divisors, whose sum is σ = 89765397504. Its totient is φ = 10086236160.

The previous prime is 31421041507. The next prime is 31421041529. The reversal of 31421041520 is 2514012413.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421041529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18235379 + ... + 18237101.

Almost surely, 2^31421041520 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 31421041520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44882698752).

31421041520 is an abundant number, since it is smaller than the sum of its proper divisors (58344355984).

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

31421041520 is a wasteful number, since it uses less digits than its factorization.

31421041520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840 (or 1834 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 31421041520 its reverse (2514012413), we get a palindrome (33935053933).

The spelling of 31421041520 in words is "thirty-one billion, four hundred twenty-one million, forty-one thousand, five hundred twenty".