21211101221022 has 12 divisors (see below), whose sum is σ = 45957385978920. Its totient is φ = 7070367073668.

The previous prime is 21211101220961. The next prime is 21211101221047. The reversal of 21211101221022 is 22012210111212.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1178394512279 = 21211101221022 / (2 + 1 + 2 + 1 + 1 + 1 + 0 + 1 + 2 + 2 + 1 + 0 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21211101220986 and 21211101221004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 589197256122 + ... + 589197256157.

It is an arithmetic number, because the mean of its divisors is an integer number (3829782164910).

Almost surely, 2^{21211101221022} is an apocalyptic number.

21211101221022 is an abundant number, since it is smaller than the sum of its proper divisors (24746284757898).

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

21211101221022 is a wasteful number, since it uses less digits than its factorization.

21211101221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178394512287 (or 1178394512284 counting only the distinct ones).

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

Adding to 21211101221022 its reverse (22012210111212), we get a palindrome (43223311332234).

The spelling of 21211101221022 in words is "twenty-one trillion, two hundred eleven billion, one hundred one million, two hundred twenty-one thousand, twenty-two".