21221221010011 has 32 divisors (see below), whose sum is σ = 23313529122048. Its totient is φ = 19156678295040.

The previous prime is 21221221009997. The next prime is 21221221010021. The reversal of 21221221010011 is 11001012212212.

It is not a de Polignac number, because 21221221010011 - 2¹⁹ = 21221220485723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221221010021) 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, 1341663775 + ... + 1341679591.

It is an arithmetic number, because the mean of its divisors is an integer number (728547785064).

Almost surely, 2^{21221221010011} is an apocalyptic number.

21221221010011 is a deficient number, since it is larger than the sum of its proper divisors (2092308112037).

21221221010011 is a wasteful number, since it uses less digits than its factorization.

21221221010011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17611.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221221010011 its reverse (11001012212212), we get a palindrome (32222233222223).

The spelling of 21221221010011 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, ten thousand, eleven".