21137276 has 12 divisors (see below), whose sum is σ = 38598672. Its totient is φ = 10109088.

The previous prime is 21137269. The next prime is 21137279. The reversal of 21137276 is 67273112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21137279) 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, 114785 + ... + 114968.

It is an arithmetic number, because the mean of its divisors is an integer number (3216556).

Almost surely, 2^21137276 is an apocalyptic number.

It is an amenable number.

21137276 is a deficient number, since it is larger than the sum of its proper divisors (17461396).

21137276 is a wasteful number, since it uses less digits than its factorization.

21137276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229780 (or 229778 counting only the distinct ones).

The product of its digits is 3528, while the sum is 29.

The square root of 21137276 is about 4597.5293365024. The cubic root of 21137276 is about 276.4922776440.

The spelling of 21137276 in words is "twenty-one million, one hundred thirty-seven thousand, two hundred seventy-six".