21131444310 has 32 divisors (see below), whose sum is σ = 50720249952. Its totient is φ = 5634520320.

The previous prime is 21131444293. The next prime is 21131444371. The reversal of 21131444310 is 1344413112.

It is a super-2 number, since 2×21131444310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 370632 + ... + 423828.

It is an arithmetic number, because the mean of its divisors is an integer number (1585007811).

Almost surely, 2^21131444310 is an apocalyptic number.

21131444310 is an abundant number, since it is smaller than the sum of its proper divisors (29588805642).

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

21131444310 is a wasteful number, since it uses less digits than its factorization.

21131444310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66448.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21131444310 its reverse (1344413112), we get a palindrome (22475857422).

The spelling of 21131444310 in words is "twenty-one billion, one hundred thirty-one million, four hundred forty-four thousand, three hundred ten".