21233300421 has 8 divisors (see below), whose sum is σ = 28428541504. Its totient is φ = 14096796480.

The previous prime is 21233300419. The next prime is 21233300443. The reversal of 21233300421 is 12400333212.

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

It is not a de Polignac number, because 21233300421 - 2¹ = 21233300419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233370421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14683441 + ... + 14684886.

It is an arithmetic number, because the mean of its divisors is an integer number (3553567688).

Almost surely, 2^21233300421 is an apocalyptic number.

It is an amenable number.

21233300421 is a deficient number, since it is larger than the sum of its proper divisors (7195241083).

21233300421 is a wasteful number, since it uses less digits than its factorization.

21233300421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29368571.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21233300421 its reverse (12400333212), we get a palindrome (33633633633).

The spelling of 21233300421 in words is "twenty-one billion, two hundred thirty-three million, three hundred thousand, four hundred twenty-one".