21144031 has 8 divisors (see below), whose sum is σ = 21669120. Its totient is φ = 20622168.

The previous prime is 21144029. The next prime is 21144043. The reversal of 21144031 is 13044112.

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

It is a cyclic number.

It is not a de Polignac number, because 21144031 - 2¹ = 21144029 is a prime.

It is a super-2 number, since 2×21144031² = 894140093857922, 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 = 21143996 and 21144014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144631) 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, 17220 + ... + 18406.

It is an arithmetic number, because the mean of its divisors is an integer number (2708640).

Almost surely, 2^21144031 is an apocalyptic number.

21144031 is a deficient number, since it is larger than the sum of its proper divisors (525089).

21144031 is a wasteful number, since it uses less digits than its factorization.

21144031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21144031 is about 4598.2639115214. The cubic root of 21144031 is about 276.5217280868.

Adding to 21144031 its reverse (13044112), we get a palindrome (34188143).

The spelling of 21144031 in words is "twenty-one million, one hundred forty-four thousand, thirty-one".