21222011996 has 24 divisors (see below), whose sum is σ = 37755448080. Its totient is φ = 10434816000.

The previous prime is 21222011969. The next prime is 21222012047. The reversal of 21222011996 is 69911022212.

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, 2205596 + ... + 2215196.

It is an arithmetic number, because the mean of its divisors is an integer number (1573143670).

Almost surely, 2^21222011996 is an apocalyptic number.

It is an amenable number.

21222011996 is a deficient number, since it is larger than the sum of its proper divisors (16533436084).

21222011996 is a wasteful number, since it uses less digits than its factorization.

21222011996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18725 (or 18723 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 21222011996 in words is "twenty-one billion, two hundred twenty-two million, eleven thousand, nine hundred ninety-six".