21151448263 has 16 divisors (see below), whose sum is σ = 24519880224. Its totient is φ = 18032117760.

The previous prime is 21151448251. The next prime is 21151448317. The reversal of 21151448263 is 36284415112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21151448263 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 (21151448203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152370 + ... + 255967.

It is an arithmetic number, because the mean of its divisors is an integer number (1532492514).

Almost surely, 2^21151448263 is an apocalyptic number.

21151448263 is a deficient number, since it is larger than the sum of its proper divisors (3368431961).

21151448263 is a wasteful number, since it uses less digits than its factorization.

21151448263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408642.

The product of its digits is 46080, while the sum is 37.

The spelling of 21151448263 in words is "twenty-one billion, one hundred fifty-one million, four hundred forty-eight thousand, two hundred sixty-three".