21001636514 has 8 divisors (see below), whose sum is σ = 31544856000. Its totient is φ = 10486684516.

The previous prime is 21001636499. The next prime is 21001636561. The reversal of 21001636514 is 41563610012.

It is a happy number.

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

It is an unprimeable number.

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, 7065014 + ... + 7067985.

It is an arithmetic number, because the mean of its divisors is an integer number (3943107000).

Almost surely, 2^21001636514 is an apocalyptic number.

21001636514 is a deficient number, since it is larger than the sum of its proper divisors (10543219486).

21001636514 is a wasteful number, since it uses less digits than its factorization.

21001636514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14133744.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21001636514 in words is "twenty-one billion, one million, six hundred thirty-six thousand, five hundred fourteen".