21011012222 has 4 divisors (see below), whose sum is σ = 31516518336. Its totient is φ = 10505506110.

The previous prime is 21011012177. The next prime is 21011012273. The reversal of 21011012222 is 22221011012.

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 = 21011012197 and 21011012206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252753054 + ... + 5252753057.

It is an arithmetic number, because the mean of its divisors is an integer number (7879129584).

Almost surely, 2^21011012222 is an apocalyptic number.

21011012222 is a deficient number, since it is larger than the sum of its proper divisors (10505506114).

21011012222 is a wasteful number, since it uses less digits than its factorization.

21011012222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505506113.

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

Adding to 21011012222 its reverse (22221011012), we get a palindrome (43232023234).

It can be divided in two parts, 21011012 and 222, that multiplied together give a palindrome (4664444664).

The spelling of 21011012222 in words is "twenty-one billion, eleven million, twelve thousand, two hundred twenty-two".