21010002122222 has 4 divisors (see below), whose sum is σ = 31515003183336. Its totient is φ = 10505001061110.

The previous prime is 21010002122189. The next prime is 21010002122261. The reversal of 21010002122222 is 22222120001012.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21010002122222.

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, 5252500530554 + ... + 5252500530557.

It is an arithmetic number, because the mean of its divisors is an integer number (7878750795834).

Almost surely, 2^{21010002122222} is an apocalyptic number.

21010002122222 is a deficient number, since it is larger than the sum of its proper divisors (10505001061114).

21010002122222 is a wasteful number, since it uses less digits than its factorization.

21010002122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505001061113.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21010002122222 its reverse (22222120001012), we get a palindrome (43232122123234).

The spelling of 21010002122222 in words is "twenty-one trillion, ten billion, two million, one hundred twenty-two thousand, two hundred twenty-two".