21001000222 has 16 divisors (see below), whose sum is σ = 32242201200. Its totient is φ = 10253722752.

The previous prime is 21001000213. The next prime is 21001000253. The reversal of 21001000222 is 22200010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001000199 and 21001000208.

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, 338904 + ... + 396052.

It is an arithmetic number, because the mean of its divisors is an integer number (2015137575).

Almost surely, 2^21001000222 is an apocalyptic number.

21001000222 is a deficient number, since it is larger than the sum of its proper divisors (11241200978).

21001000222 is a wasteful number, since it uses less digits than its factorization.

21001000222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61467.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21001000222 its reverse (22200010012), we get a palindrome (43201010234).

The spelling of 21001000222 in words is "twenty-one billion, one million, two hundred twenty-two", and thus it is an aban number.