21236286458 has 16 divisors (see below), whose sum is σ = 32302279680. Its totient is φ = 10469886336.

The previous prime is 21236286451. The next prime is 21236286497. The reversal of 21236286458 is 85468263212.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21236286451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215063 + ... + 297866.

It is an arithmetic number, because the mean of its divisors is an integer number (2018892480).

Almost surely, 2^21236286458 is an apocalyptic number.

21236286458 is a deficient number, since it is larger than the sum of its proper divisors (11065993222).

21236286458 is a wasteful number, since it uses less digits than its factorization.

21236286458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513221.

The product of its digits is 1105920, while the sum is 47.

The spelling of 21236286458 in words is "twenty-one billion, two hundred thirty-six million, two hundred eighty-six thousand, four hundred fifty-eight".