21220111100001 has 96 divisors (see below), whose sum is σ = 33200376660864. Its totient is φ = 11949857920000.

The previous prime is 21220111099991. The next prime is 21220111100003. The reversal of 21220111100001 is 10000111102212.

It is not a de Polignac number, because 21220111100001 - 2⁶ = 21220111099937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220111100001.

It is not an unprimeable number, because it can be changed into a prime (21220111100003) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 93333781 + ... + 93560861.

It is an arithmetic number, because the mean of its divisors is an integer number (345837256884).

Almost surely, 2^{21220111100001} is an apocalyptic number.

It is an amenable number.

21220111100001 is a deficient number, since it is larger than the sum of its proper divisors (11980265560863).

21220111100001 is a wasteful number, since it uses less digits than its factorization.

21220111100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227295 (or 227272 counting only the distinct ones).

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

Adding to 21220111100001 its reverse (10000111102212), we get a palindrome (31220222202213).

The spelling of 21220111100001 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, one hundred thousand, one".