21123022003 has 8 divisors (see below), whose sum is σ = 22306975488. Its totient is φ = 19961198664.

The previous prime is 21123021977. The next prime is 21123022007. The reversal of 21123022003 is 30022032112.

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 21123022003 - 2⁵ = 21123021971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123022007) 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, 5530575 + ... + 5534392.

It is an arithmetic number, because the mean of its divisors is an integer number (2788371936).

Almost surely, 2^21123022003 is an apocalyptic number.

21123022003 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21123022003 is a deficient number, since it is larger than the sum of its proper divisors (1183953485).

21123022003 is a wasteful number, since it uses less digits than its factorization.

21123022003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11065073.

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

Adding to 21123022003 its reverse (30022032112), we get a palindrome (51145054115).

The spelling of 21123022003 in words is "twenty-one billion, one hundred twenty-three million, twenty-two thousand, three".