21915514805 has 16 divisors (see below), whose sum is σ = 26942509440. Its totient is φ = 17104129728.

The previous prime is 21915514783. The next prime is 21915514811. The reversal of 21915514805 is 50841551912.

It is a cyclic number.

It is not a de Polignac number, because 21915514805 - 2³² = 17620547509 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 119639 + ... + 241131.

It is an arithmetic number, because the mean of its divisors is an integer number (1683906840).

Almost surely, 2^21915514805 is an apocalyptic number.

It is an amenable number.

21915514805 is a deficient number, since it is larger than the sum of its proper divisors (5026994635).

21915514805 is a wasteful number, since it uses less digits than its factorization.

21915514805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122380.

The product of its (nonzero) digits is 72000, while the sum is 41.

The spelling of 21915514805 in words is "twenty-one billion, nine hundred fifteen million, five hundred fourteen thousand, eight hundred five".