21032320011 has 4 divisors (see below), whose sum is σ = 28043093352. Its totient is φ = 14021546672.

The previous prime is 21032320007. The next prime is 21032320019. The reversal of 21032320011 is 11002323012.

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

It is a cyclic number.

It is not a de Polignac number, because 21032320011 - 2² = 21032320007 is a prime.

It is a super-2 number, since 2×21032320011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21032320019) 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, 3505386666 + ... + 3505386671.

It is an arithmetic number, because the mean of its divisors is an integer number (7010773338).

Almost surely, 2^21032320011 is an apocalyptic number.

21032320011 is a deficient number, since it is larger than the sum of its proper divisors (7010773341).

21032320011 is an equidigital number, since it uses as much as digits as its factorization.

21032320011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7010773340.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21032320011 its reverse (11002323012), we get a palindrome (32034643023).

The spelling of 21032320011 in words is "twenty-one billion, thirty-two million, three hundred twenty thousand, eleven".