21150145859 has 4 divisors (see below), whose sum is σ = 22394272104. Its totient is φ = 19906019616.

The previous prime is 21150145853. The next prime is 21150145871. The reversal of 21150145859 is 95854105112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21150145859 - 2⁴ = 21150145843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21150145853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622063097 + ... + 622063130.

It is an arithmetic number, because the mean of its divisors is an integer number (5598568026).

Almost surely, 2^21150145859 is an apocalyptic number.

21150145859 is a deficient number, since it is larger than the sum of its proper divisors (1244126245).

21150145859 is a wasteful number, since it uses less digits than its factorization.

21150145859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244126244.

The product of its (nonzero) digits is 72000, while the sum is 41.

The spelling of 21150145859 in words is "twenty-one billion, one hundred fifty million, one hundred forty-five thousand, eight hundred fifty-nine".