21222202011 has 32 divisors (see below), whose sum is σ = 29411831808. Its totient is φ = 13601677440.

The previous prime is 21222201989. The next prime is 21222202021. The reversal of 21222202011 is 11020222212.

It is not a de Polignac number, because 21222202011 - 2⁶ = 21222201947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222202021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9485785 + ... + 9488021.

It is an arithmetic number, because the mean of its divisors is an integer number (919119744).

Almost surely, 2^21222202011 is an apocalyptic number.

21222202011 is a deficient number, since it is larger than the sum of its proper divisors (8189629797).

21222202011 is a wasteful number, since it uses less digits than its factorization.

21222202011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3451.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222202011 its reverse (11020222212), we get a palindrome (32242424223).

The spelling of 21222202011 in words is "twenty-one billion, two hundred twenty-two million, two hundred two thousand, eleven".