21102210001 has 4 divisors (see below), whose sum is σ = 21126272692. Its totient is φ = 21078147312.

The previous prime is 21102209959. The next prime is 21102210011. The reversal of 21102210001 is 10001220112.

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 17114918976 + 3987291025 = 130824^2 + 63145^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102210001 - 2¹⁷ = 21102078929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21102210001.

It is not an unprimeable number, because it can be changed into a prime (21102210011) 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, 12030030 + ... + 12031783.

It is an arithmetic number, because the mean of its divisors is an integer number (5281568173).

Almost surely, 2^21102210001 is an apocalyptic number.

It is an amenable number.

21102210001 is a deficient number, since it is larger than the sum of its proper divisors (24062691).

21102210001 is an equidigital number, since it uses as much as digits as its factorization.

21102210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24062690.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21102210001 its reverse (10001220112), we get a palindrome (31103430113).

The spelling of 21102210001 in words is "twenty-one billion, one hundred two million, two hundred ten thousand, one".