21221110011 has 16 divisors (see below), whose sum is σ = 29528418816. Its totient is φ = 13530745536.

The previous prime is 21221110003. The next prime is 21221110037. The reversal of 21221110011 is 11001112212.

It is not a de Polignac number, because 21221110011 - 2³ = 21221110003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221110411) 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, 1051431 + ... + 1071423.

It is an arithmetic number, because the mean of its divisors is an integer number (1845526176).

Almost surely, 2^21221110011 is an apocalyptic number.

21221110011 is a deficient number, since it is larger than the sum of its proper divisors (8307308805).

21221110011 is a wasteful number, since it uses less digits than its factorization.

21221110011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35402.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21221110011 its reverse (11001112212), we get a palindrome (32222222223).

It can be divided in two parts, 212211 and 10011, that added together give a palindrome (222222).

The spelling of 21221110011 in words is "twenty-one billion, two hundred twenty-one million, one hundred ten thousand, eleven".