21211210111222 has 32 divisors (see below), whose sum is σ = 34646771520000. Its totient is φ = 9700809412896.

The previous prime is 21211210111219. The next prime is 21211210111253. The reversal of 21211210111222 is 22211101211212.

It is a happy number.

It is a super-2 number, since 2×21211210111222² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21211210111222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122366529 + ... + 122539747.

It is an arithmetic number, because the mean of its divisors is an integer number (1082711610000).

Almost surely, 2^{21211210111222} is an apocalyptic number.

21211210111222 is a deficient number, since it is larger than the sum of its proper divisors (13435561408778).

21211210111222 is a wasteful number, since it uses less digits than its factorization.

21211210111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284388.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21211210111222 its reverse (22211101211212), we get a palindrome (43422311322434).

The spelling of 21211210111222 in words is "twenty-one trillion, two hundred eleven billion, two hundred ten million, one hundred eleven thousand, two hundred twenty-two".