21436287478 has 8 divisors (see below), whose sum is σ = 32156205120. Its totient is φ = 10717552440.

The previous prime is 21436287473. The next prime is 21436287487. The reversal of 21436287478 is 87478263412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21436287473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248853 + ... + 323728.

It is an arithmetic number, because the mean of its divisors is an integer number (4019525640).

Almost surely, 2^21436287478 is an apocalyptic number.

21436287478 is a deficient number, since it is larger than the sum of its proper divisors (10719917642).

21436287478 is a wasteful number, since it uses less digits than its factorization.

21436287478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591302.

The product of its digits is 3612672, while the sum is 52.

The spelling of 21436287478 in words is "twenty-one billion, four hundred thirty-six million, two hundred eighty-seven thousand, four hundred seventy-eight".