21151520006 has 8 divisors (see below), whose sum is σ = 31841819760. Its totient is φ = 10537580088.

The previous prime is 21151519951. The next prime is 21151520017. The reversal of 21151520006 is 60002515112.

It is a happy number.

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

It is a congruent number.

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, 19089266 + ... + 19090373.

It is an arithmetic number, because the mean of its divisors is an integer number (3980227470).

Almost surely, 2^21151520006 is an apocalyptic number.

21151520006 is a deficient number, since it is larger than the sum of its proper divisors (10690299754).

21151520006 is a wasteful number, since it uses less digits than its factorization.

21151520006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38179918.

The product of its (nonzero) digits is 600, while the sum is 23.

The spelling of 21151520006 in words is "twenty-one billion, one hundred fifty-one million, five hundred twenty thousand, six".