21010021012222 has 16 divisors (see below), whose sum is σ = 34720430767344. Its totient is φ = 9455455000000.

The previous prime is 21010021012171. The next prime is 21010021012271. The reversal of 21010021012222 is 22221012001012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21010021012196 and 21010021012205.

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, 4727725279 + ... + 4727729722.

It is an arithmetic number, because the mean of its divisors is an integer number (2170026922959).

Almost surely, 2^{21010021012222} is an apocalyptic number.

21010021012222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21010021012222 is a deficient number, since it is larger than the sum of its proper divisors (13710409755122).

21010021012222 is a wasteful number, since it uses less digits than its factorization.

21010021012222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9455455115.

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

Adding to 21010021012222 its reverse (22221012001012), we get a palindrome (43231033013234).

The spelling of 21010021012222 in words is "twenty-one trillion, ten billion, twenty-one million, twelve thousand, two hundred twenty-two".