21221200211122 has 4 divisors (see below), whose sum is σ = 31831800316686. Its totient is φ = 10610600105560.

The previous prime is 21221200211117. The next prime is 21221200211129. The reversal of 21221200211122 is 22111200212212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13026028687281 + 8195171523841 = 3609159^2 + 2862721^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21221200211122.

It is not an unprimeable number, because it can be changed into a prime (21221200211129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305300052779 + ... + 5305300052782.

Almost surely, 2^{21221200211122} is an apocalyptic number.

21221200211122 is a deficient number, since it is larger than the sum of its proper divisors (10610600105564).

21221200211122 is a wasteful number, since it uses less digits than its factorization.

21221200211122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610600105563.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221200211122 its reverse (22111200212212), we get a palindrome (43332400423334).

The spelling of 21221200211122 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, two hundred eleven thousand, one hundred twenty-two".