21003032311 has 4 divisors (see below), whose sum is σ = 21004395712. Its totient is φ = 21001668912.

The previous prime is 21003032293. The next prime is 21003032327. The reversal of 21003032311 is 11323030012.

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 21003032311 - 2¹⁷ = 21002901239 is a prime.

It is a super-2 number, since 2×21003032311² (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 (21003039311) 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, 658326 + ... + 689491.

It is an arithmetic number, because the mean of its divisors is an integer number (5251098928).

Almost surely, 2^21003032311 is an apocalyptic number.

21003032311 is a deficient number, since it is larger than the sum of its proper divisors (1363401).

21003032311 is a wasteful number, since it uses less digits than its factorization.

21003032311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363400.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21003032311 its reverse (11323030012), we get a palindrome (32326062323).

The spelling of 21003032311 in words is "twenty-one billion, three million, thirty-two thousand, three hundred eleven".