21340131 has 8 divisors (see below), whose sum is σ = 29147664. Its totient is φ = 13879680.

The previous prime is 21340093. The next prime is 21340141. The reversal of 21340131 is 13104312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21340131 - 2⁷ = 21340003 is a prime.

It is a super-2 number, since 2×21340131² = 910802382194322, 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 21340131.

It is not an unprimeable number, because it can be changed into a prime (21340141) 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, 86626 + ... + 86871.

It is an arithmetic number, because the mean of its divisors is an integer number (3643458).

Almost surely, 2^21340131 is an apocalyptic number.

21340131 is a deficient number, since it is larger than the sum of its proper divisors (7807533).

21340131 is a wasteful number, since it uses less digits than its factorization.

21340131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173541.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21340131 is about 4619.5379639094. The cubic root of 21340131 is about 277.3739643546.

Adding to 21340131 its reverse (13104312), we get a palindrome (34444443).

The spelling of 21340131 in words is "twenty-one million, three hundred forty thousand, one hundred thirty-one".