21137753 has 32 divisors (see below), whose sum is σ = 27525120. Its totient is φ = 15785280.

The previous prime is 21137741. The next prime is 21137773. The reversal of 21137753 is 35773112.

It is not a de Polignac number, because 21137753 - 2⁶ = 21137689 is a prime.

It is a super-3 number, since 3×21137753³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21137773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166376 + ... + 166502.

It is an arithmetic number, because the mean of its divisors is an integer number (860160).

Almost surely, 2^21137753 is an apocalyptic number.

It is an amenable number.

21137753 is a deficient number, since it is larger than the sum of its proper divisors (6387367).

21137753 is a wasteful number, since it uses less digits than its factorization.

21137753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237.

The product of its digits is 4410, while the sum is 29.

The square root of 21137753 is about 4597.5812118983. The cubic root of 21137753 is about 276.4943574741.

The spelling of 21137753 in words is "twenty-one million, one hundred thirty-seven thousand, seven hundred fifty-three".