21022100012201 has 4 divisors (see below), whose sum is σ = 21022118501892. Its totient is φ = 21022081522512.

The previous prime is 21022100012131. The next prime is 21022100012203. The reversal of 21022100012201 is 10221000122012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8686017312025 + 12336082700176 = 2947205^2 + 3512276^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022100012201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21022100012203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7419230 + ... + 9853383.

It is an arithmetic number, because the mean of its divisors is an integer number (5255529625473).

Almost surely, 2^{21022100012201} is an apocalyptic number.

It is an amenable number.

21022100012201 is a deficient number, since it is larger than the sum of its proper divisors (18489691).

21022100012201 is a wasteful number, since it uses less digits than its factorization.

21022100012201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18489690.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21022100012201 its reverse (10221000122012), we get a palindrome (31243100134213).

It can be divided in two parts, 2 and 1022100012201, that multiplied together give a palindrome (2044200024402).

The spelling of 21022100012201 in words is "twenty-one trillion, twenty-two billion, one hundred million, twelve thousand, two hundred one".