21211101021222 has 36 divisors (see below), whose sum is σ = 53460632167956. Its totient is φ = 6060314577240.

The previous prime is 21211101021203. The next prime is 21211101021239. The reversal of 21211101021222 is 22212010111212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21211101021195 and 21211101021204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12024432804 + ... + 12024434567.

It is an arithmetic number, because the mean of its divisors is an integer number (1485017560221).

Almost surely, 2^{21211101021222} is an apocalyptic number.

21211101021222 is an abundant number, since it is smaller than the sum of its proper divisors (32249531146734).

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

21211101021222 is a wasteful number, since it uses less digits than its factorization.

21211101021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24048867393 (or 24048867383 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21211101021222 its reverse (22212010111212), we get a palindrome (43423111132434).

The spelling of 21211101021222 in words is "twenty-one trillion, two hundred eleven billion, one hundred one million, twenty-one thousand, two hundred twenty-two".