21851248151 has 8 divisors (see below), whose sum is σ = 22031948400. Its totient is φ = 21670758720.

The previous prime is 21851248079. The next prime is 21851248157. The reversal of 21851248151 is 15184215812.

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 21851248151 - 2¹⁸ = 21850986007 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 (21851248157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158945 + ... + 262613.

It is an arithmetic number, because the mean of its divisors is an integer number (2753993550).

Almost surely, 2^21851248151 is an apocalyptic number.

21851248151 is a deficient number, since it is larger than the sum of its proper divisors (180700249).

21851248151 is a wasteful number, since it uses less digits than its factorization.

21851248151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105409.

The product of its digits is 25600, while the sum is 38.

The spelling of 21851248151 in words is "twenty-one billion, eight hundred fifty-one million, two hundred forty-eight thousand, one hundred fifty-one".