21663653027 has 8 divisors (see below), whose sum is σ = 23677921152. Its totient is φ = 19731600000.

The previous prime is 21663653023. The next prime is 21663653101. The reversal of 21663653027 is 72035636612.

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 21663653027 - 2² = 21663653023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21663653023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20553224 + ... + 20554277.

It is an arithmetic number, because the mean of its divisors is an integer number (2959740144).

Almost surely, 2^21663653027 is an apocalyptic number.

21663653027 is a deficient number, since it is larger than the sum of its proper divisors (2014268125).

21663653027 is a wasteful number, since it uses less digits than its factorization.

21663653027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41107549.

The product of its (nonzero) digits is 272160, while the sum is 41.

The spelling of 21663653027 in words is "twenty-one billion, six hundred sixty-three million, six hundred fifty-three thousand, twenty-seven".