21496223616 has 64 divisors (see below), whose sum is σ = 65256401280. Its totient is φ = 6141777408.

The previous prime is 21496223587. The next prime is 21496223659. The reversal of 21496223616 is 61632269412.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×21496223616² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3995866 + ... + 4001241.

It is an arithmetic number, because the mean of its divisors is an integer number (1019631270).

Almost surely, 2^21496223616 is an apocalyptic number.

It is an amenable number.

21496223616 is an abundant number, since it is smaller than the sum of its proper divisors (43760177664).

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

21496223616 is an equidigital number, since it uses as much as digits as its factorization.

21496223616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7997131 (or 7997119 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The spelling of 21496223616 in words is "twenty-one billion, four hundred ninety-six million, two hundred twenty-three thousand, six hundred sixteen".