21332157 has 16 divisors (see below), whose sum is σ = 35461632. Its totient is φ = 11081520.

The previous prime is 21332153. The next prime is 21332159. The reversal of 21332157 is 75123312.

It is not a de Polignac number, because 21332157 - 2² = 21332153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332153) 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 15 ways as a sum of consecutive naturals, for example, 45943 + ... + 46404.

It is an arithmetic number, because the mean of its divisors is an integer number (2216352).

Almost surely, 2^21332157 is an apocalyptic number.

It is an amenable number.

21332157 is a deficient number, since it is larger than the sum of its proper divisors (14129475).

21332157 is a wasteful number, since it uses less digits than its factorization.

21332157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92368.

The product of its digits is 1260, while the sum is 24.

The square root of 21332157 is about 4618.6748099428. The cubic root of 21332157 is about 277.3394119967.

Adding to 21332157 its reverse (75123312), we get a palindrome (96455469).

The spelling of 21332157 in words is "twenty-one million, three hundred thirty-two thousand, one hundred fifty-seven".