21632151 has 4 divisors (see below), whose sum is σ = 28842872. Its totient is φ = 14421432.

The previous prime is 21632137. The next prime is 21632179. The reversal of 21632151 is 15123612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21632151 - 2⁹ = 21631639 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 (21632101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3605356 + ... + 3605361.

It is an arithmetic number, because the mean of its divisors is an integer number (7210718).

Almost surely, 2^21632151 is an apocalyptic number.

21632151 is a deficient number, since it is larger than the sum of its proper divisors (7210721).

21632151 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 11 representation: 21632151 = (11235612)₁₁.

21632151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7210720.

The product of its digits is 360, while the sum is 21.

The square root of 21632151 is about 4651.0376261647. The cubic root of 21632151 is about 278.6334390365.

Adding to 21632151 its reverse (15123612), we get a palindrome (36755763).

The spelling of 21632151 in words is "twenty-one million, six hundred thirty-two thousand, one hundred fifty-one".