21415199986 has 8 divisors (see below), whose sum is σ = 32128866540. Its totient is φ = 10705577808.

The previous prime is 21415199957. The next prime is 21415199987. The reversal of 21415199986 is 68999151412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18365399361 + 3049800625 = 135519^2 + 55225^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21415199986² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21415199987) 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 3 ways as a sum of consecutive naturals, for example, 997821 + ... + 1019056.

Almost surely, 2^21415199986 is an apocalyptic number.

21415199986 is a deficient number, since it is larger than the sum of its proper divisors (10713666554).

21415199986 is a wasteful number, since it uses less digits than its factorization.

21415199986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022188.

The product of its digits is 1399680, while the sum is 55.

The spelling of 21415199986 in words is "twenty-one billion, four hundred fifteen million, one hundred ninety-nine thousand, nine hundred eighty-six".