22001738821 has 8 divisors (see below), whose sum is σ = 22764238200. Its totient is φ = 21239494080.

The previous prime is 22001738819. The next prime is 22001738831. The reversal of 22001738821 is 12883710022.

It can be written as a sum of positive squares in 4 ways, for example, as 7365796 + 21994373025 = 2714^2 + 148305^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 22001738821 - 2¹ = 22001738819 is a prime.

It is a super-2 number, since 2×22001738821² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001738831) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 121291 + ... + 242311.

It is an arithmetic number, because the mean of its divisors is an integer number (2845529775).

Almost surely, 2^22001738821 is an apocalyptic number.

It is an amenable number.

22001738821 is a deficient number, since it is larger than the sum of its proper divisors (762499379).

22001738821 is a wasteful number, since it uses less digits than its factorization.

22001738821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127319.

The product of its (nonzero) digits is 10752, while the sum is 34.

The spelling of 22001738821 in words is "twenty-two billion, one million, seven hundred thirty-eight thousand, eight hundred twenty-one".