21551352607 has 2 divisors, whose sum is σ = 21551352608. Its totient is φ = 21551352606.

The previous prime is 21551352587. The next prime is 21551352619. The reversal of 21551352607 is 70625315512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21551352607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21551358607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10775676303 + 10775676304.

It is an arithmetic number, because the mean of its divisors is an integer number (10775676304).

Almost surely, 2^21551352607 is an apocalyptic number.

21551352607 is a deficient number, since it is larger than the sum of its proper divisors (1).

21551352607 is an equidigital number, since it uses as much as digits as its factorization.

21551352607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 37.

The spelling of 21551352607 in words is "twenty-one billion, five hundred fifty-one million, three hundred fifty-two thousand, six hundred seven".