21001102220222 has 16 divisors (see below), whose sum is σ = 31708452808032. Its totient is φ = 10431737940960.

The previous prime is 21001102220201. The next prime is 21001102220233. The reversal of 21001102220222 is 22202220110012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21001102220222.

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, 29646893 + ... + 30347000.

It is an arithmetic number, because the mean of its divisors is an integer number (1981778300502).

Almost surely, 2^{21001102220222} is an apocalyptic number.

21001102220222 is a deficient number, since it is larger than the sum of its proper divisors (10707350587810).

21001102220222 is a wasteful number, since it uses less digits than its factorization.

21001102220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59995043.

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

Adding to 21001102220222 its reverse (22202220110012), we get a palindrome (43203322330234).

The spelling of 21001102220222 in words is "twenty-one trillion, one billion, one hundred two million, two hundred twenty thousand, two hundred twenty-two".