21102211222 has 4 divisors (see below), whose sum is σ = 31653316836. Its totient is φ = 10551105610.

The previous prime is 21102211219. The next prime is 21102211279. The reversal of 21102211222 is 22211220112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21102211196 and 21102211205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275552804 + ... + 5275552807.

It is an arithmetic number, because the mean of its divisors is an integer number (7913329209).

Almost surely, 2^21102211222 is an apocalyptic number.

21102211222 is a deficient number, since it is larger than the sum of its proper divisors (10551105614).

21102211222 is a wasteful number, since it uses less digits than its factorization.

21102211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551105613.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21102211222 its reverse (22211220112), we get a palindrome (43313431334).

It can be divided in two parts, 21102 and 211222, that added together give a square (232324 = 482²).

The spelling of 21102211222 in words is "twenty-one billion, one hundred two million, two hundred eleven thousand, two hundred twenty-two".