21120310311 has 8 divisors (see below), whose sum is σ = 28163790720. Its totient is φ = 14078518392.

The previous prime is 21120310291. The next prime is 21120310319. The reversal of 21120310311 is 11301302112.

It is a happy number.

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

It is not a de Polignac number, because 21120310311 - 2⁹ = 21120309799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120310319) 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, 392641 + ... + 443178.

It is an arithmetic number, because the mean of its divisors is an integer number (3520473840).

Almost surely, 2^21120310311 is an apocalyptic number.

21120310311 is a deficient number, since it is larger than the sum of its proper divisors (7043480409).

21120310311 is an equidigital number, since it uses as much as digits as its factorization.

21120310311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844245.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21120310311 its reverse (11301302112), we get a palindrome (32421612423).

The spelling of 21120310311 in words is "twenty-one billion, one hundred twenty million, three hundred ten thousand, three hundred eleven".