21590157 has 8 divisors (see below), whose sum is σ = 29259040. Its totient is φ = 14157360.

The previous prime is 21590117. The next prime is 21590183. The reversal of 21590157 is 75109512.

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

It is a de Polignac number, because none of the positive numbers 2^k-21590157 is a prime.

It is a super-2 number, since 2×21590157² = 932269758569298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21590117) 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 7 ways as a sum of consecutive naturals, for example, 58807 + ... + 59172.

It is an arithmetic number, because the mean of its divisors is an integer number (3657380).

Almost surely, 2^21590157 is an apocalyptic number.

It is an amenable number.

21590157 is a deficient number, since it is larger than the sum of its proper divisors (7668883).

21590157 is a wasteful number, since it uses less digits than its factorization.

21590157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118043.

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 21590157 is about 4646.5209565868. The cubic root of 21590157 is about 278.4530206645.

Adding to 21590157 its reverse (75109512), we get a palindrome (96699669).

The spelling of 21590157 in words is "twenty-one million, five hundred ninety thousand, one hundred fifty-seven".