21383149 has 4 divisors (see below), whose sum is σ = 22072960. Its totient is φ = 20693340.

The previous prime is 21383143. The next prime is 21383177. The reversal of 21383149 is 94138312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21383149 - 2¹³ = 21374957 is a prime.

It is a super-2 number, since 2×21383149² = 914478122312402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 689779 = 21383149 / (2 + 1 + 3 + 8 + 3 + 1 + 4 + 9).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21383149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21383143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344859 + ... + 344920.

It is an arithmetic number, because the mean of its divisors is an integer number (5518240).

Almost surely, 2^21383149 is an apocalyptic number.

It is an amenable number.

21383149 is a deficient number, since it is larger than the sum of its proper divisors (689811).

21383149 is an equidigital number, since it uses as much as digits as its factorization.

21383149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689810.

The product of its digits is 5184, while the sum is 31.

The square root of 21383149 is about 4624.1917131538. The cubic root of 21383149 is about 277.5602185144.

The spelling of 21383149 in words is "twenty-one million, three hundred eighty-three thousand, one hundred forty-nine".