21522152005 has 4 divisors (see below), whose sum is σ = 25826582412. Its totient is φ = 17217721600.

The previous prime is 21522151999. The next prime is 21522152011. The reversal of 21522152005 is 50025122512.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21522151999) and next prime (21522152011).

It can be written as a sum of positive squares in 2 ways, for example, as 2659052356 + 18863099649 = 51566^2 + 137343^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21522152005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2152215196 + ... + 2152215205.

It is an arithmetic number, because the mean of its divisors is an integer number (6456645603).

Almost surely, 2^21522152005 is an apocalyptic number.

It is an amenable number.

21522152005 is a deficient number, since it is larger than the sum of its proper divisors (4304430407).

21522152005 is an equidigital number, since it uses as much as digits as its factorization.

21522152005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4304430406.

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 21522152005 its reverse (50025122512), we get a palindrome (71547274517).

The spelling of 21522152005 in words is "twenty-one billion, five hundred twenty-two million, one hundred fifty-two thousand, five".