31142102420 has 96 divisors (see below), whose sum is σ = 78618798720. Its totient is φ = 10210152960.

The previous prime is 31142102417. The next prime is 31142102441. The reversal of 31142102420 is 2420124113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31142102392 and 31142102401.

It is a congruent number.

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, 3635 + ... + 249594.

It is an arithmetic number, because the mean of its divisors is an integer number (818945820).

Almost surely, 2^31142102420 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 31142102420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39309399360).

31142102420 is an abundant number, since it is smaller than the sum of its proper divisors (47476696300).

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

31142102420 is a wasteful number, since it uses less digits than its factorization.

31142102420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253305 (or 253303 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31142102420 its reverse (2420124113), we get a palindrome (33562226533).

The spelling of 31142102420 in words is "thirty-one billion, one hundred forty-two million, one hundred two thousand, four hundred twenty".