21946267845 has 16 divisors (see below), whose sum is σ = 39015587520. Its totient is φ = 11704676112.

The previous prime is 21946267829. The next prime is 21946267859. The reversal of 21946267845 is 54876264912.

21946267845 is a `hidden beast` number, since 2 + 1 + 9 + 4 + 626 + 7 + 8 + 4 + 5 = 666.

It is not a de Polignac number, because 21946267845 - 2⁴ = 21946267829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21946267791 and 21946267800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81282339 + ... + 81282608.

It is an arithmetic number, because the mean of its divisors is an integer number (2438474220).

Almost surely, 2^21946267845 is an apocalyptic number.

It is an amenable number.

21946267845 is a deficient number, since it is larger than the sum of its proper divisors (17069319675).

21946267845 is a wasteful number, since it uses less digits than its factorization.

21946267845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162564961 (or 162564955 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 21946267845 in words is "twenty-one billion, nine hundred forty-six million, two hundred sixty-seven thousand, eight hundred forty-five".