21003351023 has 8 divisors (see below), whose sum is σ = 21578683392. Its totient is φ = 20433370936.

The previous prime is 21003350999. The next prime is 21003351041. The reversal of 21003351023 is 32015330012.

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 21003351023 - 2²² = 20999156719 is a prime.

It is a super-2 number, since 2×21003351023² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21003350986 and 21003351004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003351073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1330115 + ... + 1345812.

It is an arithmetic number, because the mean of its divisors is an integer number (2697335424).

Almost surely, 2^21003351023 is an apocalyptic number.

21003351023 is a deficient number, since it is larger than the sum of its proper divisors (575332369).

21003351023 is a wasteful number, since it uses less digits than its factorization.

21003351023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2676141.

The product of its (nonzero) digits is 540, while the sum is 20.

Adding to 21003351023 its reverse (32015330012), we get a palindrome (53018681035).

The spelling of 21003351023 in words is "twenty-one billion, three million, three hundred fifty-one thousand, twenty-three".