21420002233 has 4 divisors (see below), whose sum is σ = 24480002560. Its totient is φ = 18360001908.

The previous prime is 21420002231. The next prime is 21420002249. The reversal of 21420002233 is 33220002412.

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 21420002233 - 2¹ = 21420002231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21420002233.

It is not an unprimeable number, because it can be changed into a prime (21420002231) 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, 1530000153 + ... + 1530000166.

It is an arithmetic number, because the mean of its divisors is an integer number (6120000640).

Almost surely, 2^21420002233 is an apocalyptic number.

It is an amenable number.

21420002233 is a deficient number, since it is larger than the sum of its proper divisors (3060000327).

21420002233 is an equidigital number, since it uses as much as digits as its factorization.

21420002233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3060000326.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21420002233 its reverse (33220002412), we get a palindrome (54640004645).

The spelling of 21420002233 in words is "twenty-one billion, four hundred twenty million, two thousand, two hundred thirty-three".