21501564106 has 8 divisors (see below), whose sum is σ = 35184377664. Its totient is φ = 9773438220.

The previous prime is 21501564083. The next prime is 21501564151. The reversal of 21501564106 is 60146510512.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488671890 + ... + 488671933.

It is an arithmetic number, because the mean of its divisors is an integer number (4398047208).

Almost surely, 2^21501564106 is an apocalyptic number.

21501564106 is a deficient number, since it is larger than the sum of its proper divisors (13682813558).

21501564106 is a wasteful number, since it uses less digits than its factorization.

21501564106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977343836.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 21501564106 in words is "twenty-one billion, five hundred one million, five hundred sixty-four thousand, one hundred six".