21361983 has 8 divisors (see below), whose sum is σ = 28884096. Its totient is φ = 14040600.

The previous prime is 21361957. The next prime is 21362041. The reversal of 21361983 is 38916312.

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

It is not a de Polignac number, because 21361983 - 2⁶ = 21361919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361933) 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, 49933 + ... + 50358.

It is an arithmetic number, because the mean of its divisors is an integer number (3610512).

Almost surely, 2^21361983 is an apocalyptic number.

21361983 is a deficient number, since it is larger than the sum of its proper divisors (7522113).

21361983 is a wasteful number, since it uses less digits than its factorization.

21361983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100365.

The product of its digits is 7776, while the sum is 33.

The square root of 21361983 is about 4621.9025303440. The cubic root of 21361983 is about 277.4686077629.

The spelling of 21361983 in words is "twenty-one million, three hundred sixty-one thousand, nine hundred eighty-three".