21371383 has 12 divisors (see below), whose sum is σ = 23604840. Its totient is φ = 19334480.

The previous prime is 21371377. The next prime is 21371401. The reversal of 21371383 is 38317312.

It is not a de Polignac number, because 21371383 - 2¹³ = 21363191 is a prime.

It is a super-2 number, since 2×21371383² = 913472022665378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41733 + ... + 42241.

It is an arithmetic number, because the mean of its divisors is an integer number (1967070).

Almost surely, 2^21371383 is an apocalyptic number.

21371383 is a deficient number, since it is larger than the sum of its proper divisors (2233457).

21371383 is a wasteful number, since it uses less digits than its factorization.

21371383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878 (or 867 counting only the distinct ones).

The product of its digits is 3024, while the sum is 28.

The square root of 21371383 is about 4622.9193157571. The cubic root of 21371383 is about 277.5093003403.

Adding to 21371383 its reverse (38317312), we get a palindrome (59688695).

The spelling of 21371383 in words is "twenty-one million, three hundred seventy-one thousand, three hundred eighty-three".