21100211221022 has 4 divisors (see below), whose sum is σ = 31650316831536. Its totient is φ = 10550105610510.

The previous prime is 21100211221009. The next prime is 21100211221057. The reversal of 21100211221022 is 22012211200112.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275052805254 + ... + 5275052805257.

It is an arithmetic number, because the mean of its divisors is an integer number (7912579207884).

Almost surely, 2^{21100211221022} is an apocalyptic number.

21100211221022 is a deficient number, since it is larger than the sum of its proper divisors (10550105610514).

21100211221022 is a wasteful number, since it uses less digits than its factorization.

21100211221022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10550105610513.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21100211221022 its reverse (22012211200112), we get a palindrome (43112422421134).

The spelling of 21100211221022 in words is "twenty-one trillion, one hundred billion, two hundred eleven million, two hundred twenty-one thousand, twenty-two".