21315141 has 24 divisors (see below), whose sum is σ = 31505760. Its totient is φ = 13884000.

The previous prime is 21315139. The next prime is 21315163. The reversal of 21315141 is 14151312.

It is not a de Polignac number, because 21315141 - 2¹ = 21315139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21315101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118990 + ... + 119168.

It is an arithmetic number, because the mean of its divisors is an integer number (1312740).

Almost surely, 2^21315141 is an apocalyptic number.

It is an amenable number.

21315141 is a deficient number, since it is larger than the sum of its proper divisors (10190619).

21315141 is a wasteful number, since it uses less digits than its factorization.

21315141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 414 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 21315141 is about 4616.8323556309. The cubic root of 21315141 is about 277.2656506985.

Adding to 21315141 its reverse (14151312), we get a palindrome (35466453).

The spelling of 21315141 in words is "twenty-one million, three hundred fifteen thousand, one hundred forty-one".