21331400511 has 4 divisors (see below), whose sum is σ = 28441867352. Its totient is φ = 14220933672.

The previous prime is 21331400509. The next prime is 21331400521. The reversal of 21331400511 is 11500413312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21331400511 - 2¹ = 21331400509 is a prime.

It is a super-2 number, since 2×21331400511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331400521) 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, 3555233416 + ... + 3555233421.

It is an arithmetic number, because the mean of its divisors is an integer number (7110466838).

Almost surely, 2^21331400511 is an apocalyptic number.

21331400511 is a deficient number, since it is larger than the sum of its proper divisors (7110466841).

21331400511 is an equidigital number, since it uses as much as digits as its factorization.

21331400511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110466840.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21331400511 its reverse (11500413312), we get a palindrome (32831813823).

The spelling of 21331400511 in words is "twenty-one billion, three hundred thirty-one million, four hundred thousand, five hundred eleven".