21145610506015 has 8 divisors (see below), whose sum is σ = 25375934132208. Its totient is φ = 16915687388160.

The previous prime is 21145610505983. The next prime is 21145610506057. The reversal of 21145610506015 is 51060501654112.

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

It is not a de Polignac number, because 21145610506015 - 2⁵ = 21145610505983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100010917 + ... + 100222126.

It is an arithmetic number, because the mean of its divisors is an integer number (3171991766526).

Almost surely, 2^{21145610506015} is an apocalyptic number.

21145610506015 is a deficient number, since it is larger than the sum of its proper divisors (4230323626193).

21145610506015 is a wasteful number, since it uses less digits than its factorization.

21145610506015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200254169.

The product of its (nonzero) digits is 36000, while the sum is 37.

The spelling of 21145610506015 in words is "twenty-one trillion, one hundred forty-five billion, six hundred ten million, five hundred six thousand, fifteen".