21213223007 has 2 divisors, whose sum is σ = 21213223008. Its totient is φ = 21213223006.

The previous prime is 21213222991. The next prime is 21213223043. The reversal of 21213223007 is 70032231212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213223007 - 2⁴ = 21213222991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213223307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606611503 + 10606611504.

It is an arithmetic number, because the mean of its divisors is an integer number (10606611504).

Almost surely, 2^21213223007 is an apocalyptic number.

21213223007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213223007 is an equidigital number, since it uses as much as digits as its factorization.

21213223007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

Adding to 21213223007 its reverse (70032231212), we get a palindrome (91245454219).

The spelling of 21213223007 in words is "twenty-one billion, two hundred thirteen million, two hundred twenty-three thousand, seven".