21137048 has 16 divisors (see below), whose sum is σ = 39691080. Its totient is φ = 10552768.

The previous prime is 21137041. The next prime is 21137057. The reversal of 21137048 is 84073112.

It is a super-3 number, since 3×21137048³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21137041) 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, 5315 + ... + 8397.

Almost surely, 2^21137048 is an apocalyptic number.

It is an amenable number.

21137048 is a deficient number, since it is larger than the sum of its proper divisors (18554032).

21137048 is a wasteful number, since it uses less digits than its factorization.

21137048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946 (or 3942 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21137048 is about 4597.5045405089. The cubic root of 21137048 is about 276.4912835004.

The spelling of 21137048 in words is "twenty-one million, one hundred thirty-seven thousand, forty-eight".