21311020003 has 8 divisors (see below), whose sum is σ = 26228947808. Its totient is φ = 16861466304.

The previous prime is 21311019997. The next prime is 21311020039. The reversal of 21311020003 is 30002011312.

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

It is a cyclic number.

It is not a de Polignac number, because 21311020003 - 2⁵ = 21311019971 is a prime.

It is a super-2 number, since 2×21311020003² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (21311020043) 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, 117093426 + ... + 117093607.

It is an arithmetic number, because the mean of its divisors is an integer number (3278618476).

Almost surely, 2^21311020003 is an apocalyptic number.

21311020003 is a deficient number, since it is larger than the sum of its proper divisors (4917927805).

21311020003 is a wasteful number, since it uses less digits than its factorization.

21311020003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234187053.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21311020003 its reverse (30002011312), we get a palindrome (51313031315).

The spelling of 21311020003 in words is "twenty-one billion, three hundred eleven million, twenty thousand, three".