21436307487 has 72 divisors (see below), whose sum is σ = 37718370144. Its totient is φ = 11675131776.

The previous prime is 21436307483. The next prime is 21436307513. The reversal of 21436307487 is 78470363412.

21436307487 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 630 + 7 + 4 + 8 + 7 = 666.

It is not a de Polignac number, because 21436307487 - 2² = 21436307483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21436307483) 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 71 ways as a sum of consecutive naturals, for example, 2968293 + ... + 2975505.

It is an arithmetic number, because the mean of its divisors is an integer number (523866252).

Almost surely, 2^21436307487 is an apocalyptic number.

21436307487 is a deficient number, since it is larger than the sum of its proper divisors (16282062657).

21436307487 is a wasteful number, since it uses less digits than its factorization.

21436307487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7549 (or 7539 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 21436307487 in words is "twenty-one billion, four hundred thirty-six million, three hundred seven thousand, four hundred eighty-seven".