21510152005 has 8 divisors (see below), whose sum is σ = 25997882400. Its totient is φ = 17084321616.

The previous prime is 21510151937. The next prime is 21510152029. The reversal of 21510152005 is 50025101512.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21510152005 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15474235 + ... + 15475624.

It is an arithmetic number, because the mean of its divisors is an integer number (3249735300).

Almost surely, 2^21510152005 is an apocalyptic number.

It is an amenable number.

21510152005 is a deficient number, since it is larger than the sum of its proper divisors (4487730395).

21510152005 is a wasteful number, since it uses less digits than its factorization.

21510152005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30950003.

The product of its (nonzero) digits is 500, while the sum is 22.

Adding to 21510152005 its reverse (50025101512), we get a palindrome (71535253517).

The spelling of 21510152005 in words is "twenty-one billion, five hundred ten million, one hundred fifty-two thousand, five".