21131483 has 4 divisors (see below), whose sum is σ = 21261288. Its totient is φ = 21001680.

The previous prime is 21131449. The next prime is 21131489. The reversal of 21131483 is 38413112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21131483 - 2⁶ = 21131419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64658 + ... + 64983.

It is an arithmetic number, because the mean of its divisors is an integer number (5315322).

Almost surely, 2^21131483 is an apocalyptic number.

21131483 is a deficient number, since it is larger than the sum of its proper divisors (129805).

21131483 is a wasteful number, since it uses less digits than its factorization.

21131483 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129804.

The product of its digits is 576, while the sum is 23.

The square root of 21131483 is about 4596.8992810372. The cubic root of 21131483 is about 276.4670163298.

Adding to 21131483 its reverse (38413112), we get a palindrome (59544595).

The spelling of 21131483 in words is "twenty-one million, one hundred thirty-one thousand, four hundred eighty-three".