21101305882 has 8 divisors (see below), whose sum is σ = 31655023956. Its totient is φ = 10549631232.

The previous prime is 21101305847. The next prime is 21101305889. The reversal of 21101305882 is 28850310112.

It can be written as a sum of positive squares in 2 ways, for example, as 20932591761 + 168714121 = 144681^2 + 12989^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21101305889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484773 + ... + 526504.

Almost surely, 2^21101305882 is an apocalyptic number.

21101305882 is a deficient number, since it is larger than the sum of its proper divisors (10553718074).

21101305882 is a wasteful number, since it uses less digits than its factorization.

21101305882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021712.

The product of its (nonzero) digits is 3840, while the sum is 31.

Adding to 21101305882 its reverse (28850310112), we get a palindrome (49951615994).

The spelling of 21101305882 in words is "twenty-one billion, one hundred one million, three hundred five thousand, eight hundred eighty-two".