21337371 has 16 divisors (see below), whose sum is σ = 34485120. Its totient is φ = 12931560.

The previous prime is 21337369. The next prime is 21337439. The reversal of 21337371 is 17373312.

It is not a de Polignac number, because 21337371 - 2¹ = 21337369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21337471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35625 + ... + 36218.

It is an arithmetic number, because the mean of its divisors is an integer number (2155320).

Almost surely, 2^21337371 is an apocalyptic number.

21337371 is a deficient number, since it is larger than the sum of its proper divisors (13147749).

21337371 is a wasteful number, since it uses less digits than its factorization.

21337371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71863 (or 71857 counting only the distinct ones).

The product of its digits is 2646, while the sum is 27.

The square root of 21337371 is about 4619.2392230756. The cubic root of 21337371 is about 277.3620058972.

It can be divided in two parts, 213373 and 71, that added together give a square (213444 = 462²).

The spelling of 21337371 in words is "twenty-one million, three hundred thirty-seven thousand, three hundred seventy-one".