21123200101 has 4 divisors (see below), whose sum is σ = 21124377100. Its totient is φ = 21122023104.

The previous prime is 21123200099. The next prime is 21123200117. The reversal of 21123200101 is 10100232112.

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 16544647876 + 4578552225 = 128626^2 + 67665^2 .

It is a cyclic number.

It is not a de Polignac number, because 21123200101 - 2¹ = 21123200099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123200171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561156 + ... + 597613.

It is an arithmetic number, because the mean of its divisors is an integer number (5281094275).

Almost surely, 2^21123200101 is an apocalyptic number.

It is an amenable number.

21123200101 is a deficient number, since it is larger than the sum of its proper divisors (1176999).

21123200101 is a wasteful number, since it uses less digits than its factorization.

21123200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176998.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21123200101 its reverse (10100232112), we get a palindrome (31223432213).

The spelling of 21123200101 in words is "twenty-one billion, one hundred twenty-three million, two hundred thousand, one hundred one".