21011222220222 has 16 divisors (see below), whose sum is σ = 45254940166800. Its totient is φ = 6464991452352.

The previous prime is 21011222220221. The next prime is 21011222220257. The reversal of 21011222220222 is 22202222211012.

It is a super-2 number, since 2×21011222220222² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011222220221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134687321847 + ... + 134687322002.

It is an arithmetic number, because the mean of its divisors is an integer number (2828433760425).

Almost surely, 2^{21011222220222} is an apocalyptic number.

21011222220222 is an abundant number, since it is smaller than the sum of its proper divisors (24243717946578).

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

21011222220222 is a wasteful number, since it uses less digits than its factorization.

21011222220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269374643867.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21011222220222 its reverse (22202222211012), we get a palindrome (43213444431234).

The spelling of 21011222220222 in words is "twenty-one trillion, eleven billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twenty-two".