21210022433 has 4 divisors (see below), whose sum is σ = 21526590000. Its totient is φ = 20893454868.

The previous prime is 21210022429. The next prime is 21210022439. The reversal of 21210022433 is 33422001212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21210022433 - 2² = 21210022429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21210022439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158283683 + ... + 158283816.

It is an arithmetic number, because the mean of its divisors is an integer number (5381647500).

Almost surely, 2^21210022433 is an apocalyptic number.

It is an amenable number.

21210022433 is a deficient number, since it is larger than the sum of its proper divisors (316567567).

21210022433 is an equidigital number, since it uses as much as digits as its factorization.

21210022433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316567566.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21210022433 its reverse (33422001212), we get a palindrome (54632023645).

The spelling of 21210022433 in words is "twenty-one billion, two hundred ten million, twenty-two thousand, four hundred thirty-three".