21194474515 has 8 divisors (see below), whose sum is σ = 26929450080. Its totient is φ = 15958192512.

The previous prime is 21194474501. The next prime is 21194474533. The reversal of 21194474515 is 51547449112.

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

It is a cyclic number.

It is not a de Polignac number, because 21194474515 - 2⁹ = 21194474003 is a prime.

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, 124673295 + ... + 124673464.

It is an arithmetic number, because the mean of its divisors is an integer number (3366181260).

Almost surely, 2^21194474515 is an apocalyptic number.

21194474515 is a deficient number, since it is larger than the sum of its proper divisors (5734975565).

21194474515 is a wasteful number, since it uses less digits than its factorization.

21194474515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249346781.

The product of its digits is 201600, while the sum is 43.

The spelling of 21194474515 in words is "twenty-one billion, one hundred ninety-four million, four hundred seventy-four thousand, five hundred fifteen".