21134149 has 4 divisors (see below), whose sum is σ = 21343500. Its totient is φ = 20924800.

The previous prime is 21134143. The next prime is 21134173. The reversal of 21134149 is 94143112.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20702500 + 431649 = 4550^2 + 657^2 .

It is a cyclic number.

It is not a de Polignac number, because 21134149 - 2⁵ = 21134117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134143) 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, 104524 + ... + 104725.

It is an arithmetic number, because the mean of its divisors is an integer number (5335875).

Almost surely, 2^21134149 is an apocalyptic number.

It is an amenable number.

21134149 is a deficient number, since it is larger than the sum of its proper divisors (209351).

21134149 is a wasteful number, since it uses less digits than its factorization.

21134149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209350.

The product of its digits is 864, while the sum is 25.

The square root of 21134149 is about 4597.1892499657. The cubic root of 21134149 is about 276.4786424277.

The spelling of 21134149 in words is "twenty-one million, one hundred thirty-four thousand, one hundred forty-nine".