21000021110222 has 16 divisors (see below), whose sum is σ = 39272766751872. Its totient is φ = 8181826406520.

The previous prime is 21000021110179. The next prime is 21000021110267. The reversal of 21000021110222 is 22201112000012.

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 = 21000021110197 and 21000021110206.

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, 68181886568 + ... + 68181886875.

It is an arithmetic number, because the mean of its divisors is an integer number (2454547921992).

Almost surely, 2^{21000021110222} is an apocalyptic number.

21000021110222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21000021110222 is a deficient number, since it is larger than the sum of its proper divisors (18272745641650).

21000021110222 is a wasteful number, since it uses less digits than its factorization.

21000021110222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136363773463.

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

Adding to 21000021110222 its reverse (22201112000012), we get a palindrome (43201133110234).

The spelling of 21000021110222 in words is "twenty-one trillion, twenty-one million, one hundred ten thousand, two hundred twenty-two".