21022003123 has 48 divisors (see below), whose sum is σ = 26586040320. Its totient is φ = 16489440000.

The previous prime is 21022003117. The next prime is 21022003129. The reversal of 21022003123 is 32130022012.

It is an interprime number because it is at equal distance from previous prime (21022003117) and next prime (21022003129).

It is not a de Polignac number, because 21022003123 - 2⁵ = 21022003091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21022003097 and 21022003106.

It is not an unprimeable number, because it can be changed into a prime (21022003129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1202898 + ... + 1220248.

It is an arithmetic number, because the mean of its divisors is an integer number (553875840).

Almost surely, 2^21022003123 is an apocalyptic number.

21022003123 is a deficient number, since it is larger than the sum of its proper divisors (5564037197).

21022003123 is a wasteful number, since it uses less digits than its factorization.

21022003123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17440 (or 17429 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21022003123 its reverse (32130022012), we get a palindrome (53152025135).

The spelling of 21022003123 in words is "twenty-one billion, twenty-two million, three thousand, one hundred twenty-three".