21000023222 has 8 divisors (see below), whose sum is σ = 31811916672. Its totient is φ = 10396051000.

The previous prime is 21000023221. The next prime is 21000023273. The reversal of 21000023222 is 22232000012.

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

It is a super-2 number, since 2×21000023222² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000023197 and 21000023206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000023221) 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, 51980054 + ... + 51980457.

It is an arithmetic number, because the mean of its divisors is an integer number (3976489584).

Almost surely, 2^21000023222 is an apocalyptic number.

21000023222 is a deficient number, since it is larger than the sum of its proper divisors (10811893450).

21000023222 is a wasteful number, since it uses less digits than its factorization.

21000023222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103960614.

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 21000023222 its reverse (22232000012), we get a palindrome (43232023234).

The spelling of 21000023222 in words is "twenty-one billion, twenty-three thousand, two hundred twenty-two".