21772316545 has 32 divisors (see below), whose sum is σ = 30031596288. Its totient is φ = 14843609088.

The previous prime is 21772316513. The next prime is 21772316563. The reversal of 21772316545 is 54561327712.

It is a happy number.

It is not a de Polignac number, because 21772316545 - 2⁵ = 21772316513 is a prime.

It is a Duffinian 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 31 ways as a sum of consecutive naturals, for example, 5547954 + ... + 5551876.

It is an arithmetic number, because the mean of its divisors is an integer number (938487384).

Almost surely, 2^21772316545 is an apocalyptic number.

It is an amenable number.

21772316545 is a deficient number, since it is larger than the sum of its proper divisors (8259279743).

21772316545 is a wasteful number, since it uses less digits than its factorization.

21772316545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4809.

The product of its digits is 352800, while the sum is 43.

The spelling of 21772316545 in words is "twenty-one billion, seven hundred seventy-two million, three hundred sixteen thousand, five hundred forty-five".