21363441 has 32 divisors (see below), whose sum is σ = 33291648. Its totient is φ = 12042240.

The previous prime is 21363439. The next prime is 21363443. The reversal of 21363441 is 14436312.

It is an interprime number because it is at equal distance from previous prime (21363439) and next prime (21363443).

It is not a de Polignac number, because 21363441 - 2¹ = 21363439 is a prime.

It is a super-2 number, since 2×21363441² = 912793222720962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21363443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63225 + ... + 63561.

It is an arithmetic number, because the mean of its divisors is an integer number (1040364).

Almost surely, 2^21363441 is an apocalyptic number.

It is an amenable number.

21363441 is a deficient number, since it is larger than the sum of its proper divisors (11928207).

21363441 is a wasteful number, since it uses less digits than its factorization.

21363441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481.

The product of its digits is 1728, while the sum is 24.

The square root of 21363441 is about 4622.0602549080. The cubic root of 21363441 is about 277.4749202235.

Adding to 21363441 its reverse (14436312), we get a palindrome (35799753).

The spelling of 21363441 in words is "twenty-one million, three hundred sixty-three thousand, four hundred forty-one".