21073746722 has 16 divisors (see below), whose sum is σ = 36151667712. Its totient is φ = 9025294560.

The previous prime is 21073746679. The next prime is 21073746763. The reversal of 21073746722 is 22764737012.

It is a self number, because there is not a number n which added to its sum of digits gives 21073746722.

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 7 ways as a sum of consecutive naturals, for example, 505154 + ... + 545277.

It is an arithmetic number, because the mean of its divisors is an integer number (2259479232).

Almost surely, 2^21073746722 is an apocalyptic number.

21073746722 is a deficient number, since it is larger than the sum of its proper divisors (15077920990).

21073746722 is a wasteful number, since it uses less digits than its factorization.

21073746722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051873.

The product of its (nonzero) digits is 197568, while the sum is 41.

The spelling of 21073746722 in words is "twenty-one billion, seventy-three million, seven hundred forty-six thousand, seven hundred twenty-two".