21111001221122 has 4 divisors (see below), whose sum is σ = 31666501831686. Its totient is φ = 10555500610560.

The previous prime is 21111001221031. The next prime is 21111001221173. The reversal of 21111001221122 is 22112210011112.

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., 20691681513721 + 419319707401 = 4548811^2 + 647549^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21111001221122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277750305279 + ... + 5277750305282.

Almost surely, 2^{21111001221122} is an apocalyptic number.

21111001221122 is a deficient number, since it is larger than the sum of its proper divisors (10555500610564).

21111001221122 is a wasteful number, since it uses less digits than its factorization.

21111001221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10555500610563.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111001221122 its reverse (22112210011112), we get a palindrome (43223211232234).

The spelling of 21111001221122 in words is "twenty-one trillion, one hundred eleven billion, one million, two hundred twenty-one thousand, one hundred twenty-two".