21244105460 has 12 divisors (see below), whose sum is σ = 44612621508. Its totient is φ = 8497642176.

The previous prime is 21244105451. The next prime is 21244105489. The reversal of 21244105460 is 6450144212.

It can be written as a sum of positive squares in 2 ways, for example, as 16743842404 + 4500263056 = 129398^2 + 67084^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531102617 + ... + 531102656.

It is an arithmetic number, because the mean of its divisors is an integer number (3717718459).

Almost surely, 2^21244105460 is an apocalyptic number.

21244105460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21244105460 is an abundant number, since it is smaller than the sum of its proper divisors (23368516048).

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

21244105460 is a wasteful number, since it uses less digits than its factorization.

21244105460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062205282 (or 1062205280 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 21244105460 its reverse (6450144212), we get a palindrome (27694249672).

The spelling of 21244105460 in words is "twenty-one billion, two hundred forty-four million, one hundred five thousand, four hundred sixty".