21137054 has 4 divisors (see below), whose sum is σ = 31705584. Its totient is φ = 10568526.

The previous prime is 21137041. The next prime is 21137057. The reversal of 21137054 is 45073112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21137057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5284262 + ... + 5284265.

It is an arithmetic number, because the mean of its divisors is an integer number (7926396).

Almost surely, 2^21137054 is an apocalyptic number.

21137054 is a deficient number, since it is larger than the sum of its proper divisors (10568530).

21137054 is a wasteful number, since it uses less digits than its factorization.

21137054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10568529.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21137054 is about 4597.5051930368. The cubic root of 21137054 is about 276.4913096622.

The spelling of 21137054 in words is "twenty-one million, one hundred thirty-seven thousand, fifty-four".