16315021220 has 24 divisors (see below), whose sum is σ = 34327327608. Its totient is φ = 6513478400.

The previous prime is 16315021211. The next prime is 16315021223. The reversal of 16315021220 is 2212051361.

It can be written as a sum of positive squares in 4 ways, for example, as 3919761664 + 12395259556 = 62608^2 + 111334^2 .

It is not an unprimeable number, because it can be changed into a prime (16315021223) 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, 772451 + ... + 793290.

It is an arithmetic number, because the mean of its divisors is an integer number (1430305317).

Almost surely, 2^16315021220 is an apocalyptic number.

16315021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16315021220 is an abundant number, since it is smaller than the sum of its proper divisors (18012306388).

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

16315021220 is a wasteful number, since it uses less digits than its factorization.

16315021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566271 (or 1566269 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 16315021220 its reverse (2212051361), we get a palindrome (18527072581).

The spelling of 16315021220 in words is "sixteen billion, three hundred fifteen million, twenty-one thousand, two hundred twenty".