21211101222 has 64 divisors (see below), whose sum is σ = 44562216960. Its totient is φ = 6722856576.

The previous prime is 21211101209. The next prime is 21211101257. The reversal of 21211101222 is 22210111212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10401679 + ... + 10403717.

It is an arithmetic number, because the mean of its divisors is an integer number (696284640).

Almost surely, 2^21211101222 is an apocalyptic number.

21211101222 is an abundant number, since it is smaller than the sum of its proper divisors (23351115738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211101222 is a wasteful number, since it uses less digits than its factorization.

21211101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211101222 its reverse (22210111212), we get a palindrome (43421212434).

The spelling of 21211101222 in words is "twenty-one billion, two hundred eleven million, one hundred one thousand, two hundred twenty-two".