21222222021122 has 8 divisors (see below), whose sum is σ = 31833354043596. Its totient is φ = 10611104006592.

The previous prime is 21222222021071. The next prime is 21222222021137. The reversal of 21222222021122 is 22112022222212.

It can be written as a sum of positive squares in 2 ways, for example, as 17182608426481 + 4039613594641 = 4145191^2 + 2009879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21222222021122² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2038958 + ... + 6826550.

Almost surely, 2^{21222222021122} is an apocalyptic number.

21222222021122 is a deficient number, since it is larger than the sum of its proper divisors (10611132022474).

21222222021122 is a wasteful number, since it uses less digits than its factorization.

21222222021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7003972.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21222222021122 its reverse (22112022222212), we get a palindrome (43334244243334).

The spelling of 21222222021122 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-two million, twenty-one thousand, one hundred twenty-two".