21134131 has 4 divisors (see below), whose sum is σ = 21143592. Its totient is φ = 21124672.

The previous prime is 21134123. The next prime is 21134143. The reversal of 21134131 is 13143112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21134131 - 2³ = 21134123 is a prime.

It is a super-2 number, since 2×21134131² = 893302986250322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21134231) 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 3 ways as a sum of consecutive naturals, for example, 696 + ... + 6538.

It is an arithmetic number, because the mean of its divisors is an integer number (5285898).

Almost surely, 2^21134131 is an apocalyptic number.

21134131 is a deficient number, since it is larger than the sum of its proper divisors (9461).

21134131 is an equidigital number, since it uses as much as digits as its factorization.

21134131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9460.

The product of its digits is 72, while the sum is 16.

The square root of 21134131 is about 4597.1872922473. The cubic root of 21134131 is about 276.4785639352.

Adding to 21134131 its reverse (13143112), we get a palindrome (34277243).

It can be divided in two parts, 21 and 134131, that multiplied together give a triangular number (2816751 = T₂₃₇₃).

The spelling of 21134131 in words is "twenty-one million, one hundred thirty-four thousand, one hundred thirty-one".