21132103123 has 8 divisors (see below), whose sum is σ = 21298606560. Its totient is φ = 20966198400.

The previous prime is 21132103121. The next prime is 21132103159. The reversal of 21132103123 is 32130123112.

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 21132103123 - 2¹ = 21132103121 is a prime.

It is a super-2 number, since 2×21132103123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21132103123.

It is not an unprimeable number, because it can be changed into a prime (21132103121) 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, 78678 + ... + 220123.

It is an arithmetic number, because the mean of its divisors is an integer number (2662325820).

Almost surely, 2^21132103123 is an apocalyptic number.

21132103123 is a deficient number, since it is larger than the sum of its proper divisors (166503437).

21132103123 is a wasteful number, since it uses less digits than its factorization.

21132103123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299357.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21132103123 its reverse (32130123112), we get a palindrome (53262226235).

The spelling of 21132103123 in words is "twenty-one billion, one hundred thirty-two million, one hundred three thousand, one hundred twenty-three".