21552250007 has 8 divisors (see below), whose sum is σ = 22226244480. Its totient is φ = 20888545720.

The previous prime is 21552249881. The next prime is 21552250009. The reversal of 21552250007 is 70005225512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21552250007 - 2²⁰ = 21551201431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552250009) 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 in 7 ways as a sum of consecutive naturals, for example, 2568293 + ... + 2576670.

It is an arithmetic number, because the mean of its divisors is an integer number (2778280560).

Almost surely, 2^21552250007 is an apocalyptic number.

21552250007 is a deficient number, since it is larger than the sum of its proper divisors (673994473).

21552250007 is an equidigital number, since it uses as much as digits as its factorization.

21552250007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5145093.

The product of its (nonzero) digits is 7000, while the sum is 29.

Adding to 21552250007 its reverse (70005225512), we get a palindrome (91557475519).

The spelling of 21552250007 in words is "twenty-one billion, five hundred fifty-two million, two hundred fifty thousand, seven".