21100002201 has 8 divisors (see below), whose sum is σ = 31259262560. Its totient is φ = 14066668116.

The previous prime is 21100002181. The next prime is 21100002221. The reversal of 21100002201 is 10220000112.

It is an interprime number because it is at equal distance from previous prime (21100002181) and next prime (21100002221).

It is not a de Polignac number, because 21100002201 - 2⁶ = 21100002137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100002221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390740755 + ... + 390740808.

It is an arithmetic number, because the mean of its divisors is an integer number (3907407820).

Almost surely, 2^21100002201 is an apocalyptic number.

It is an amenable number.

21100002201 is a deficient number, since it is larger than the sum of its proper divisors (10159260359).

21100002201 is an equidigital number, since it uses as much as digits as its factorization.

21100002201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781481572 (or 781481566 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21100002201 its reverse (10220000112), we get a palindrome (31320002313).

The spelling of 21100002201 in words is "twenty-one billion, one hundred million, two thousand, two hundred one".