21232021007 has 2 divisors, whose sum is σ = 21232021008. Its totient is φ = 21232021006.

The previous prime is 21232021001. The next prime is 21232021009. The reversal of 21232021007 is 70012023212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21232021007 - 2¹⁰ = 21232019983 is a prime.

Together with 21232021009, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21232021007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232021001) 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 as a sum of consecutive naturals, namely, 10616010503 + 10616010504.

It is an arithmetic number, because the mean of its divisors is an integer number (10616010504).

Almost surely, 2^21232021007 is an apocalyptic number.

21232021007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232021007 is an equidigital number, since it uses as much as digits as its factorization.

21232021007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

Adding to 21232021007 its reverse (70012023212), we get a palindrome (91244044219).

The spelling of 21232021007 in words is "twenty-one billion, two hundred thirty-two million, twenty-one thousand, seven".