21137133 has 8 divisors (see below), whose sum is σ = 29092096. Its totient is φ = 13636800.

The previous prime is 21137119. The next prime is 21137153. The reversal of 21137133 is 33173112.

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

It is not a de Polignac number, because 21137133 - 2¹³ = 21128941 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 (21137153) 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, 113548 + ... + 113733.

It is an arithmetic number, because the mean of its divisors is an integer number (3636512).

Almost surely, 2^21137133 is an apocalyptic number.

It is an amenable number.

21137133 is a deficient number, since it is larger than the sum of its proper divisors (7954963).

21137133 is a wasteful number, since it uses less digits than its factorization.

21137133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227315.

The product of its digits is 378, while the sum is 21.

The square root of 21137133 is about 4597.5137846449. The cubic root of 21137133 is about 276.4916541250.

The spelling of 21137133 in words is "twenty-one million, one hundred thirty-seven thousand, one hundred thirty-three".