21024131 has 8 divisors (see below), whose sum is σ = 21477120. Its totient is φ = 20575368.

The previous prime is 21024097. The next prime is 21024137. The reversal of 21024131 is 13142012.

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 21024131 - 2⁶ = 21024067 is a prime.

It is a super-2 number, since 2×21024131² = 884028168610322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21024137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10250 + ... + 12128.

It is an arithmetic number, because the mean of its divisors is an integer number (2684640).

Almost surely, 2^21024131 is an apocalyptic number.

21024131 is a deficient number, since it is larger than the sum of its proper divisors (452989).

21024131 is a wasteful number, since it uses less digits than its factorization.

21024131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21024131 is about 4585.2078469792. The cubic root of 21024131 is about 275.9980527413.

Adding to 21024131 its reverse (13142012), we get a palindrome (34166143).

The spelling of 21024131 in words is "twenty-one million, twenty-four thousand, one hundred thirty-one".