21946798072 has 16 divisors (see below), whose sum is σ = 41729828400. Its totient is φ = 10818843840.

The previous prime is 21946798063. The next prime is 21946798129. The reversal of 21946798072 is 27089764912.

It is a super-2 number, since 2×21946798072² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19318797 + ... + 19319932.

It is an arithmetic number, because the mean of its divisors is an integer number (2608114275).

Almost surely, 2^21946798072 is an apocalyptic number.

It is an amenable number.

21946798072 is a deficient number, since it is larger than the sum of its proper divisors (19783030328).

21946798072 is a wasteful number, since it uses less digits than its factorization.

21946798072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38638806 (or 38638802 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 21946798072 in words is "twenty-one billion, nine hundred forty-six million, seven hundred ninety-eight thousand, seventy-two".