21450800158 has 24 divisors (see below), whose sum is σ = 35979233400. Its totient is φ = 9563200128.

The previous prime is 21450800153. The next prime is 21450800183. The reversal of 21450800158 is 85100805412.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450800153) 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 11 ways as a sum of consecutive naturals, for example, 965653 + ... + 987616.

It is an arithmetic number, because the mean of its divisors is an integer number (1499134725).

Almost surely, 2^21450800158 is an apocalyptic number.

21450800158 is a deficient number, since it is larger than the sum of its proper divisors (14528433242).

21450800158 is a wasteful number, since it uses less digits than its factorization.

21450800158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953324 (or 1953307 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 34.

The spelling of 21450800158 in words is "twenty-one billion, four hundred fifty million, eight hundred thousand, one hundred fifty-eight".