21461131 has 8 divisors (see below), whose sum is σ = 22621680. Its totient is φ = 20328672.

The previous prime is 21461113. The next prime is 21461137. The reversal of 21461131 is 13116412.

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 21461131 - 2¹³ = 21452939 is a prime.

It is a super-2 number, since 2×21461131² = 921160287598322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21461099 and 21461108.

It is not an unprimeable number, because it can be changed into a prime (21461137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5445 + ... + 8518.

It is an arithmetic number, because the mean of its divisors is an integer number (2827710).

Almost surely, 2^21461131 is an apocalyptic number.

21461131 is a deficient number, since it is larger than the sum of its proper divisors (1160549).

21461131 is a wasteful number, since it uses less digits than its factorization.

21461131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14045.

The product of its digits is 144, while the sum is 19.

The square root of 21461131 is about 4632.6159996270. The cubic root of 21461131 is about 277.8972197388.

Adding to 21461131 its reverse (13116412), we get a palindrome (34577543).

The spelling of 21461131 in words is "twenty-one million, four hundred sixty-one thousand, one hundred thirty-one".