2631321220 has 24 divisors (see below), whose sum is σ = 6028118208. Its totient is φ = 956844000.

The previous prime is 2631321197. The next prime is 2631321221. The reversal of 2631321220 is 221231362.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 2631321191 and 2631321200.

It is not an unprimeable number, because it can be changed into a prime (2631321221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5980056 + ... + 5980495.

It is an arithmetic number, because the mean of its divisors is an integer number (251171592).

Almost surely, 2^2631321220 is an apocalyptic number.

2631321220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2631321220 is an abundant number, since it is smaller than the sum of its proper divisors (3396796988).

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

2631321220 is a wasteful number, since it uses less digits than its factorization.

2631321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11960571 (or 11960569 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 2631321220 is about 51296.4055270932. The cubic root of 2631321220 is about 1380.5684873381.

Adding to 2631321220 its reverse (221231362), we get a palindrome (2852552582).

The spelling of 2631321220 in words is "two billion, six hundred thirty-one million, three hundred twenty-one thousand, two hundred twenty".