21222222100211 has 6 divisors (see below), whose sum is σ = 23326905283836. Its totient is φ = 19292929181900.

The previous prime is 21222222100187. The next prime is 21222222100241. The reversal of 21222222100211 is 11200122222212.

It is not a de Polignac number, because 21222222100211 - 2³⁴ = 21205042231027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222222100241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87695132525 + ... + 87695132766.

It is an arithmetic number, because the mean of its divisors is an integer number (3887817547306).

Almost surely, 2^{21222222100211} is an apocalyptic number.

21222222100211 is a deficient number, since it is larger than the sum of its proper divisors (2104683183625).

21222222100211 is a wasteful number, since it uses less digits than its factorization.

21222222100211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175390265313 (or 175390265302 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21222222100211 its reverse (11200122222212), we get a palindrome (32422344322423).

The spelling of 21222222100211 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-two million, one hundred thousand, two hundred eleven".