21000222022 has 16 divisors (see below), whose sum is σ = 33981251472. Its totient is φ = 9675891360.

The previous prime is 21000222007. The next prime is 21000222071. The reversal of 21000222022 is 22022200012.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21000221993 and 21000222011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 672729 + ... + 703252.

It is an arithmetic number, because the mean of its divisors is an integer number (2123828217).

Almost surely, 2^21000222022 is an apocalyptic number.

21000222022 is a deficient number, since it is larger than the sum of its proper divisors (12981029450).

21000222022 is a wasteful number, since it uses less digits than its factorization.

21000222022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376583.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 21000222022 its reverse (22022200012), we get a palindrome (43022422034).

The spelling of 21000222022 in words is "twenty-one billion, two hundred twenty-two thousand, twenty-two".