21633546068 has 6 divisors (see below), whose sum is σ = 37858705626. Its totient is φ = 10816773032.

The previous prime is 21633546047. The next prime is 21633546073. The reversal of 21633546068 is 86064533612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21530279824 + 103266244 = 146732^2 + 10162^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2704193255 + ... + 2704193262.

It is an arithmetic number, because the mean of its divisors is an integer number (6309784271).

Almost surely, 2^21633546068 is an apocalyptic number.

It is an amenable number.

21633546068 is a deficient number, since it is larger than the sum of its proper divisors (16225159558).

21633546068 is a wasteful number, since it uses less digits than its factorization.

21633546068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5408386521 (or 5408386519 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 21633546068 in words is "twenty-one billion, six hundred thirty-three million, five hundred forty-six thousand, sixty-eight".