21201101511 has 8 divisors (see below), whose sum is σ = 28542583680. Its totient is φ = 13996843512.

The previous prime is 21201101479. The next prime is 21201101513. The reversal of 21201101511 is 11510110212.

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

It is not a de Polignac number, because 21201101511 - 2⁵ = 21201101479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201101513) 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, 34305681 + ... + 34306298.

It is an arithmetic number, because the mean of its divisors is an integer number (3567822960).

Almost surely, 2^21201101511 is an apocalyptic number.

21201101511 is a deficient number, since it is larger than the sum of its proper divisors (7341482169).

21201101511 is a wasteful number, since it uses less digits than its factorization.

21201101511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68612085.

The product of its (nonzero) digits is 20, while the sum is 15.

Adding to 21201101511 its reverse (11510110212), we get a palindrome (32711211723).

The spelling of 21201101511 in words is "twenty-one billion, two hundred one million, one hundred one thousand, five hundred eleven".