21223901722 has 8 divisors (see below), whose sum is σ = 31837502772. Its totient is φ = 10611400800.

The previous prime is 21223901717. The next prime is 21223901723. The reversal of 21223901722 is 22710932212.

It can be written as a sum of positive squares in 2 ways, for example, as 17307770481 + 3916131241 = 131559^2 + 62579^2 .

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

It is a super-2 number, since 2×21223901722² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21223901723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224979 + ... + 305062.

Almost surely, 2^21223901722 is an apocalyptic number.

21223901722 is a deficient number, since it is larger than the sum of its proper divisors (10613601050).

21223901722 is a wasteful number, since it uses less digits than its factorization.

21223901722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550064.

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 21223901722 in words is "twenty-one billion, two hundred twenty-three million, nine hundred one thousand, seven hundred twenty-two".