20221721071 has 8 divisors (see below), whose sum is σ = 21687646320. Its totient is φ = 18795958272.

The previous prime is 20221721057. The next prime is 20221721077. The reversal of 20221721071 is 17012712202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221721071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221721077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10039570 + ... + 10041583.

It is an arithmetic number, because the mean of its divisors is an integer number (2710955790).

Almost surely, 2^20221721071 is an apocalyptic number.

20221721071 is a deficient number, since it is larger than the sum of its proper divisors (1465925249).

20221721071 is a wasteful number, since it uses less digits than its factorization.

20221721071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20081225.

The product of its (nonzero) digits is 784, while the sum is 25.

The spelling of 20221721071 in words is "twenty billion, two hundred twenty-one million, seven hundred twenty-one thousand, seventy-one".