21078795616 has 12 divisors (see below), whose sum is σ = 41498878932. Its totient is φ = 10539397792.

The previous prime is 21078795613. The next prime is 21078795629. The reversal of 21078795616 is 61659787012.

It is a super-2 number, since 2×21078795616² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21078795613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329356150 + ... + 329356213.

It is an arithmetic number, because the mean of its divisors is an integer number (3458239911).

Almost surely, 2^21078795616 is an apocalyptic number.

It is an amenable number.

21078795616 is a deficient number, since it is larger than the sum of its proper divisors (20420083316).

21078795616 is an equidigital number, since it uses as much as digits as its factorization.

21078795616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658712373 (or 658712365 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 21078795616 in words is "twenty-one billion, seventy-eight million, seven hundred ninety-five thousand, six hundred sixteen".