21337031 has 8 divisors (see below), whose sum is σ = 22548480. Its totient is φ = 20149272.

The previous prime is 21337003. The next prime is 21337037. The reversal of 21337031 is 13073312.

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 a de Polignac number, because none of the positive numbers 2^k-21337031 is a prime.

It is a super-2 number, since 2×21337031² = 910537783789922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21336994 and 21337012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4055 + ... + 7688.

It is an arithmetic number, because the mean of its divisors is an integer number (2818560).

Almost surely, 2^21337031 is an apocalyptic number.

21337031 is a deficient number, since it is larger than the sum of its proper divisors (1211449).

21337031 is a wasteful number, since it uses less digits than its factorization.

21337031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11845.

The product of its (nonzero) digits is 378, while the sum is 20.

The square root of 21337031 is about 4619.2024203319. The cubic root of 21337031 is about 277.3605326825.

The spelling of 21337031 in words is "twenty-one million, three hundred thirty-seven thousand, thirty-one".