21102011201 has 8 divisors (see below), whose sum is σ = 21188814504. Its totient is φ = 21015244800.

The previous prime is 21102011191. The next prime is 21102011233. The reversal of 21102011201 is 10211020112.

It can be written as a sum of positive squares in 4 ways, for example, as 12232138801 + 8869872400 = 110599^2 + 94180^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102011201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102011101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2126351 + ... + 2136251.

It is an arithmetic number, because the mean of its divisors is an integer number (2648601813).

Almost surely, 2^21102011201 is an apocalyptic number.

It is an amenable number.

21102011201 is a deficient number, since it is larger than the sum of its proper divisors (86803303).

21102011201 is an equidigital number, since it uses as much as digits as its factorization.

21102011201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18451.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21102011201 its reverse (10211020112), we get a palindrome (31313031313).

The spelling of 21102011201 in words is "twenty-one billion, one hundred two million, eleven thousand, two hundred one".