21158850291959 has 8 divisors (see below), whose sum is σ = 21291624889440. Its totient is φ = 21026314285056.

The previous prime is 21158850291923. The next prime is 21158850292043. The reversal of 21158850291959 is 95919205885112.

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-21158850291959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21158850291895 and 21158850291904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21158850221959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59469722 + ... + 59824455.

It is an arithmetic number, because the mean of its divisors is an integer number (2661453111180).

Almost surely, 2^{21158850291959} is an apocalyptic number.

21158850291959 is a deficient number, since it is larger than the sum of its proper divisors (132774597481).

21158850291959 is a wasteful number, since it uses less digits than its factorization.

21158850291959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119295289.

The product of its (nonzero) digits is 23328000, while the sum is 65.

The spelling of 21158850291959 in words is "twenty-one trillion, one hundred fifty-eight billion, eight hundred fifty million, two hundred ninety-one thousand, nine hundred fifty-nine".