21195409015 has 8 divisors (see below), whose sum is σ = 27746717328. Its totient is φ = 15414842880.

The previous prime is 21195408961. The next prime is 21195409049. The reversal of 21195409015 is 51090459112.

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

It is not a de Polignac number, because 21195409015 - 2¹⁹ = 21194884727 is a prime.

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, 192685482 + ... + 192685591.

It is an arithmetic number, because the mean of its divisors is an integer number (3468339666).

Almost surely, 2^21195409015 is an apocalyptic number.

21195409015 is a deficient number, since it is larger than the sum of its proper divisors (6551308313).

21195409015 is a wasteful number, since it uses less digits than its factorization.

21195409015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385371089.

The product of its (nonzero) digits is 16200, while the sum is 37.

The spelling of 21195409015 in words is "twenty-one billion, one hundred ninety-five million, four hundred nine thousand, fifteen".