21021110222 has 32 divisors (see below), whose sum is σ = 38118131712. Its totient is φ = 8499294144.

The previous prime is 21021110197. The next prime is 21021110239. The reversal of 21021110222 is 22201112012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21021110197 and 21021110206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423638 + ... + 470649.

It is an arithmetic number, because the mean of its divisors is an integer number (1191191616).

Almost surely, 2^21021110222 is an apocalyptic number.

21021110222 is a deficient number, since it is larger than the sum of its proper divisors (17097021490).

21021110222 is a wasteful number, since it uses less digits than its factorization.

21021110222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894392.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021110222 its reverse (22201112012), we get a palindrome (43222222234).

The spelling of 21021110222 in words is "twenty-one billion, twenty-one million, one hundred ten thousand, two hundred twenty-two".