21003032123 has 8 divisors (see below), whose sum is σ = 21777698880. Its totient is φ = 20231727040.

The previous prime is 21003032119. The next prime is 21003032131. The reversal of 21003032123 is 32123030012.

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

It is not a de Polignac number, because 21003032123 - 2² = 21003032119 is a prime.

It is a super-2 number, since 2×21003032123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003032173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827690 + ... + 852687.

It is an arithmetic number, because the mean of its divisors is an integer number (2722212360).

Almost surely, 2^21003032123 is an apocalyptic number.

21003032123 is a deficient number, since it is larger than the sum of its proper divisors (774666757).

21003032123 is a wasteful number, since it uses less digits than its factorization.

21003032123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680837.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21003032123 its reverse (32123030012), we get a palindrome (53126062135).

The spelling of 21003032123 in words is "twenty-one billion, three million, thirty-two thousand, one hundred twenty-three".