21033002123 has 8 divisors (see below), whose sum is σ = 25451700192. Its totient is φ = 16967799936.

The previous prime is 21033002113. The next prime is 21033002161. The reversal of 21033002123 is 32120033012.

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 21033002123 - 2⁶ = 21033002059 is a prime.

It is a super-2 number, since 2×21033002123² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033002113) 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, 88373840 + ... + 88374077.

It is an arithmetic number, because the mean of its divisors is an integer number (3181462524).

Almost surely, 2^21033002123 is an apocalyptic number.

21033002123 is a deficient number, since it is larger than the sum of its proper divisors (4418698069).

21033002123 is a wasteful number, since it uses less digits than its factorization.

21033002123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176747941.

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

Adding to 21033002123 its reverse (32120033012), we get a palindrome (53153035135).

The spelling of 21033002123 in words is "twenty-one billion, thirty-three million, two thousand, one hundred twenty-three".