21522316007 has 2 divisors, whose sum is σ = 21522316008. Its totient is φ = 21522316006.

The previous prime is 21522315977. The next prime is 21522316021. The reversal of 21522316007 is 70061322512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21522316007 - 2³² = 17227348711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21522316027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10761158003 + 10761158004.

It is an arithmetic number, because the mean of its divisors is an integer number (10761158004).

Almost surely, 2^21522316007 is an apocalyptic number.

21522316007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21522316007 is an equidigital number, since it uses as much as digits as its factorization.

21522316007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

Adding to 21522316007 its reverse (70061322512), we get a palindrome (91583638519).

The spelling of 21522316007 in words is "twenty-one billion, five hundred twenty-two million, three hundred sixteen thousand, seven".