21333230121 has 16 divisors (see below), whose sum is σ = 32523960704. Its totient is φ = 12184349184.

The previous prime is 21333230101. The next prime is 21333230123. The reversal of 21333230121 is 12103233312.

It is not a de Polignac number, because 21333230121 - 2⁹ = 21333229609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21333230123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209470 + ... + 294183.

It is an arithmetic number, because the mean of its divisors is an integer number (2032747544).

Almost surely, 2^21333230121 is an apocalyptic number.

21333230121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21333230121 is a deficient number, since it is larger than the sum of its proper divisors (11190730583).

21333230121 is a wasteful number, since it uses less digits than its factorization.

21333230121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505680.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21333230121 its reverse (12103233312), we get a palindrome (33436463433).

The spelling of 21333230121 in words is "twenty-one billion, three hundred thirty-three million, two hundred thirty thousand, one hundred twenty-one".