21670447360 has 36 divisors (see below), whose sum is σ = 51907496508. Its totient is φ = 8668178432.

The previous prime is 21670447343. The next prime is 21670447363. The reversal of 21670447360 is 6374407612.

It can be written as a sum of positive squares in 2 ways, for example, as 17033382144 + 4637065216 = 130512^2 + 68096^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (21670447363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8463739 + ... + 8466298.

It is an arithmetic number, because the mean of its divisors is an integer number (1441874903).

Almost surely, 2^21670447360 is an apocalyptic number.

21670447360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21670447360 is an abundant number, since it is smaller than the sum of its proper divisors (30237049148).

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

21670447360 is an equidigital number, since it uses as much as digits as its factorization.

21670447360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16930058 (or 16930044 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The spelling of 21670447360 in words is "twenty-one billion, six hundred seventy million, four hundred forty-seven thousand, three hundred sixty".