21241131 has 16 divisors (see below), whose sum is σ = 28790784. Its totient is φ = 13928544.

The previous prime is 21241123. The next prime is 21241147. The reversal of 21241131 is 13114212.

It is not a de Polignac number, because 21241131 - 2³ = 21241123 is a prime.

It is a super-2 number, since 2×21241131² = 902371292318322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21241131.

It is not an unprimeable number, because it can be changed into a prime (21241331) 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, 74916 + ... + 75198.

It is an arithmetic number, because the mean of its divisors is an integer number (1799424).

Almost surely, 2^21241131 is an apocalyptic number.

21241131 is a deficient number, since it is larger than the sum of its proper divisors (7549653).

21241131 is a wasteful number, since it uses less digits than its factorization.

21241131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610.

The product of its digits is 48, while the sum is 15.

The square root of 21241131 is about 4608.8101501364. The cubic root of 21241131 is about 276.9443731782.

Adding to 21241131 its reverse (13114212), we get a palindrome (34355343).

The spelling of 21241131 in words is "twenty-one million, two hundred forty-one thousand, one hundred thirty-one".