21220101112011 has 16 divisors (see below), whose sum is σ = 29962028224800. Its totient is φ = 13312689504768.

The previous prime is 21220101111997. The next prime is 21220101112051. The reversal of 21220101112011 is 11021110102212.

It is a happy number.

It is not a de Polignac number, because 21220101112011 - 2⁶ = 21220101111947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220101112051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29069416 + ... + 29790453.

It is an arithmetic number, because the mean of its divisors is an integer number (1872626764050).

Almost surely, 2^{21220101112011} is an apocalyptic number.

21220101112011 is a deficient number, since it is larger than the sum of its proper divisors (8741927112789).

21220101112011 is a wasteful number, since it uses less digits than its factorization.

21220101112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58866958.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21220101112011 its reverse (11021110102212), we get a palindrome (32241211214223).

The spelling of 21220101112011 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, one hundred twelve thousand, eleven".