31143121420 has 48 divisors (see below), whose sum is σ = 67701973248. Its totient is φ = 12021166080.

The previous prime is 31143121409. The next prime is 31143121453. The reversal of 31143121420 is 2412134113.

It is a junction number, because it is equal to n+sod(n) for n = 31143121391 and 31143121400.

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, 147712 + ... + 290008.

It is an arithmetic number, because the mean of its divisors is an integer number (1410457776).

Almost surely, 2^31143121420 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 31143121420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33850986624).

31143121420 is an abundant number, since it is smaller than the sum of its proper divisors (36558851828).

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

31143121420 is a wasteful number, since it uses less digits than its factorization.

31143121420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142690 (or 142688 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 31143121420 its reverse (2412134113), we get a palindrome (33555255533).

The spelling of 31143121420 in words is "thirty-one billion, one hundred forty-three million, one hundred twenty-one thousand, four hundred twenty".