21002211211011 has 16 divisors (see below), whose sum is σ = 29668293162144. Its totient is φ = 13169807957504.

The previous prime is 21002211210997. The next prime is 21002211211019. The reversal of 21002211211011 is 11011211220012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21002211211011 - 2⁶ = 21002211210947 is a prime.

It is a super-2 number, since 2×21002211211011² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21002211211019) 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, 125697840 + ... + 125864813.

It is an arithmetic number, because the mean of its divisors is an integer number (1854268322634).

Almost surely, 2^{21002211211011} is an apocalyptic number.

21002211211011 is a deficient number, since it is larger than the sum of its proper divisors (8666081951133).

21002211211011 is a wasteful number, since it uses less digits than its factorization.

21002211211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251564310.

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

Adding to 21002211211011 its reverse (11011211220012), we get a palindrome (32013422431023).

Subtracting from 21002211211011 its reverse (11011211220012), we obtain a palindrome (9990999990999).

The spelling of 21002211211011 in words is "twenty-one trillion, two billion, two hundred eleven million, two hundred eleven thousand, eleven".