21772320554 has 8 divisors (see below), whose sum is σ = 32822594400. Its totient is φ = 10831455756.

The previous prime is 21772320547. The next prime is 21772320611. The reversal of 21772320554 is 45502327712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21772320554² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27351764 + ... + 27352559.

It is an arithmetic number, because the mean of its divisors is an integer number (4102824300).

Almost surely, 2^21772320554 is an apocalyptic number.

21772320554 is a deficient number, since it is larger than the sum of its proper divisors (11050273846).

21772320554 is a wasteful number, since it uses less digits than its factorization.

21772320554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54704524.

The product of its (nonzero) digits is 117600, while the sum is 38.

The spelling of 21772320554 in words is "twenty-one billion, seven hundred seventy-two million, three hundred twenty thousand, five hundred fifty-four".