21147376858 has 4 divisors (see below), whose sum is σ = 31721065290. Its totient is φ = 10573688428.

The previous prime is 21147376787. The next prime is 21147376867. The reversal of 21147376858 is 85867374112.

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

It can be written as a sum of positive squares in only one way, i.e., 20859158329 + 288218529 = 144427^2 + 16977^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5286844213 + ... + 5286844216.

Almost surely, 2^21147376858 is an apocalyptic number.

21147376858 is a deficient number, since it is larger than the sum of its proper divisors (10573688432).

21147376858 is a wasteful number, since it uses less digits than its factorization.

21147376858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10573688431.

The product of its digits is 2257920, while the sum is 52.

The spelling of 21147376858 in words is "twenty-one billion, one hundred forty-seven million, three hundred seventy-six thousand, eight hundred fifty-eight".