21772128742 has 80 divisors (see below), whose sum is σ = 41235873840. Its totient is φ = 8569907136.

The previous prime is 21772128713. The next prime is 21772128751. The reversal of 21772128742 is 24782127712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14294793 + ... + 14296315.

It is an arithmetic number, because the mean of its divisors is an integer number (515448423).

Almost surely, 2^21772128742 is an apocalyptic number.

21772128742 is a deficient number, since it is larger than the sum of its proper divisors (19463745098).

21772128742 is a wasteful number, since it uses less digits than its factorization.

21772128742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795 (or 1774 counting only the distinct ones).

The product of its digits is 175616, while the sum is 43.

The spelling of 21772128742 in words is "twenty-one billion, seven hundred seventy-two million, one hundred twenty-eight thousand, seven hundred forty-two".