21037087 has 8 divisors (see below), whose sum is σ = 21464352. Its totient is φ = 20613600.

The previous prime is 21037061. The next prime is 21037103. The reversal of 21037087 is 78073012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21037087 - 2⁷ = 21036959 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 (21037187) 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, 12033 + ... + 13669.

It is an arithmetic number, because the mean of its divisors is an integer number (2683044).

Almost surely, 2^21037087 is an apocalyptic number.

21037087 is a deficient number, since it is larger than the sum of its proper divisors (427265).

21037087 is a wasteful number, since it uses less digits than its factorization.

21037087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 21037087 is about 4586.6204333910. The cubic root of 21037087 is about 276.0547351712.

The spelling of 21037087 in words is "twenty-one million, thirty-seven thousand, eighty-seven".