21101332563 has 12 divisors (see below), whose sum is σ = 30759334320. Its totient is φ = 13938494256.

The previous prime is 21101332537. The next prime is 21101332583. The reversal of 21101332563 is 36523310112.

It is not a de Polignac number, because 21101332563 - 2¹⁰ = 21101331539 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21101332513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10754031 + ... + 10755992.

It is an arithmetic number, because the mean of its divisors is an integer number (2563277860).

Almost surely, 2^21101332563 is an apocalyptic number.

21101332563 is a deficient number, since it is larger than the sum of its proper divisors (9658001757).

21101332563 is a wasteful number, since it uses less digits than its factorization.

21101332563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21510138 (or 21510135 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

Adding to 21101332563 its reverse (36523310112), we get a palindrome (57624642675).

The spelling of 21101332563 in words is "twenty-one billion, one hundred one million, three hundred thirty-two thousand, five hundred sixty-three".