21002201101111 has 16 divisors (see below), whose sum is σ = 22284206983584. Its totient is φ = 19725412670464.

The previous prime is 21002201101097. The next prime is 21002201101129. The reversal of 21002201101111 is 11110110220012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21002201101111 - 2⁷ = 21002201100983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002201101091 and 21002201101100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002201108111) 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, 15514296 + ... + 16813618.

It is an arithmetic number, because the mean of its divisors is an integer number (1392762936474).

Almost surely, 2^{21002201101111} is an apocalyptic number.

21002201101111 is a deficient number, since it is larger than the sum of its proper divisors (1282005882473).

21002201101111 is a wasteful number, since it uses less digits than its factorization.

21002201101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301330.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21002201101111 its reverse (11110110220012), we get a palindrome (32112311321123).

The spelling of 21002201101111 in words is "twenty-one trillion, two billion, two hundred one million, one hundred one thousand, one hundred eleven".