21320947710 has 128 divisors (see below), whose sum is σ = 58522383360. Its totient is φ = 5519622528.

The previous prime is 21320947631. The next prime is 21320947751. The reversal of 21320947710 is 1774902312.

It is a super-2 number, since 2×21320947710² (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 63 ways as a sum of consecutive naturals, for example, 5022849 + ... + 5027091.

It is an arithmetic number, because the mean of its divisors is an integer number (457206120).

Almost surely, 2^21320947710 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21320947710, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29261191680).

21320947710 is an abundant number, since it is smaller than the sum of its proper divisors (37201435650).

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

21320947710 is a wasteful number, since it uses less digits than its factorization.

21320947710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4799 (or 4793 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The spelling of 21320947710 in words is "twenty-one billion, three hundred twenty million, nine hundred forty-seven thousand, seven hundred ten".