21023003121 has 8 divisors (see below), whose sum is σ = 28934886144. Its totient is φ = 13563227760.

The previous prime is 21023003119. The next prime is 21023003123. The reversal of 21023003121 is 12130032012.

It is an interprime number because it is at equal distance from previous prime (21023003119) and next prime (21023003123).

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

It is not a de Polignac number, because 21023003121 - 2¹ = 21023003119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21023003121.

It is not an unprimeable number, because it can be changed into a prime (21023003123) 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, 113026806 + ... + 113026991.

It is an arithmetic number, because the mean of its divisors is an integer number (3616860768).

Almost surely, 2^21023003121 is an apocalyptic number.

It is an amenable number.

21023003121 is a deficient number, since it is larger than the sum of its proper divisors (7911883023).

21023003121 is a wasteful number, since it uses less digits than its factorization.

21023003121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226053831.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21023003121 its reverse (12130032012), we get a palindrome (33153035133).

The spelling of 21023003121 in words is "twenty-one billion, twenty-three million, three thousand, one hundred twenty-one".