21461343380 has 24 divisors (see below), whose sum is σ = 45144086400. Its totient is φ = 8570201120.

The previous prime is 21461343341. The next prime is 21461343389. The reversal of 21461343380 is 8334316412.

It is a self number, because there is not a number n which added to its sum of digits gives 21461343380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461343389) 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, 883736 + ... + 907695.

It is an arithmetic number, because the mean of its divisors is an integer number (1881003600).

Almost surely, 2^21461343380 is an apocalyptic number.

21461343380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21461343380 is an abundant number, since it is smaller than the sum of its proper divisors (23682743020).

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

21461343380 is a wasteful number, since it uses less digits than its factorization.

21461343380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792039 (or 1792037 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

Adding to 21461343380 its reverse (8334316412), we get a palindrome (29795659792).

The spelling of 21461343380 in words is "twenty-one billion, four hundred sixty-one million, three hundred forty-three thousand, three hundred eighty".