21153663311 has 8 divisors (see below), whose sum is σ = 23305207248. Its totient is φ = 19040200000.

The previous prime is 21153663301. The next prime is 21153663331. The reversal of 21153663311 is 11336635112.

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 21153663311 - 2¹⁸ = 21153401167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153663301) 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, 9518990 + ... + 9521211.

It is an arithmetic number, because the mean of its divisors is an integer number (2913150906).

Almost surely, 2^21153663311 is an apocalyptic number.

21153663311 is a deficient number, since it is larger than the sum of its proper divisors (2151543937).

21153663311 is a wasteful number, since it uses less digits than its factorization.

21153663311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19040313.

The product of its digits is 9720, while the sum is 32.

The spelling of 21153663311 in words is "twenty-one billion, one hundred fifty-three million, six hundred sixty-three thousand, three hundred eleven".