21001223202311 has 8 divisors (see below), whose sum is σ = 22910651500800. Its totient is φ = 19091832602040.

The previous prime is 21001223202307. The next prime is 21001223202361. The reversal of 21001223202311 is 11320232210012.

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

It is not a de Polignac number, because 21001223202311 - 2² = 21001223202307 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 (21001223202361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8253401 + ... + 10493858.

It is an arithmetic number, because the mean of its divisors is an integer number (2863831437600).

Almost surely, 2^{21001223202311} is an apocalyptic number.

21001223202311 is a deficient number, since it is larger than the sum of its proper divisors (1909428298489).

21001223202311 is a wasteful number, since it uses less digits than its factorization.

21001223202311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18849109.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21001223202311 its reverse (11320232210012), we get a palindrome (32321455412323).

The spelling of 21001223202311 in words is "twenty-one trillion, one billion, two hundred twenty-three million, two hundred two thousand, three hundred eleven".