31421140220 has 12 divisors (see below), whose sum is σ = 65984394504. Its totient is φ = 12568456080.

The previous prime is 31421140217. The next prime is 31421140229. The reversal of 31421140220 is 2204112413.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1571057011 = 31421140220 / (3 + 1 + 4 + 2 + 1 + 1 + 4 + 0 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 31421140192 and 31421140201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421140229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785528486 + ... + 785528525.

It is an arithmetic number, because the mean of its divisors is an integer number (5498699542).

Almost surely, 2^31421140220 is an apocalyptic number.

It is an amenable number.

31421140220 is an abundant number, since it is smaller than the sum of its proper divisors (34563254284).

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

31421140220 is a wasteful number, since it uses less digits than its factorization.

31421140220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571057020 (or 1571057018 counting only the distinct ones).

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

Adding to 31421140220 its reverse (2204112413), we get a palindrome (33625252633).

The spelling of 31421140220 in words is "thirty-one billion, four hundred twenty-one million, one hundred forty thousand, two hundred twenty".