21632105155 has 8 divisors (see below), whose sum is σ = 25970322672. Its totient is φ = 17297819808.

The previous prime is 21632105123. The next prime is 21632105189. The reversal of 21632105155 is 55150123612.

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 21632105155 - 2⁵ = 21632105123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970924 + ... + 992953.

It is an arithmetic number, because the mean of its divisors is an integer number (3246290334).

Almost surely, 2^21632105155 is an apocalyptic number.

21632105155 is a deficient number, since it is larger than the sum of its proper divisors (4338217517).

21632105155 is a wasteful number, since it uses less digits than its factorization.

21632105155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966085.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 21632105155 its reverse (55150123612), we get a palindrome (76782228767).

The spelling of 21632105155 in words is "twenty-one billion, six hundred thirty-two million, one hundred five thousand, one hundred fifty-five".