21003122222 has 4 divisors (see below), whose sum is σ = 31504683336. Its totient is φ = 10501561110.

The previous prime is 21003122213. The next prime is 21003122237. The reversal of 21003122222 is 22222130012.

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

It is a super-2 number, since 2×21003122222² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003122222.

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, 5250780554 + ... + 5250780557.

It is an arithmetic number, because the mean of its divisors is an integer number (7876170834).

Almost surely, 2^21003122222 is an apocalyptic number.

21003122222 is a deficient number, since it is larger than the sum of its proper divisors (10501561114).

21003122222 is a wasteful number, since it uses less digits than its factorization.

21003122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10501561113.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21003122222 its reverse (22222130012), we get a palindrome (43225252234).

The spelling of 21003122222 in words is "twenty-one billion, three million, one hundred twenty-two thousand, two hundred twenty-two".