21032361 has 24 divisors (see below), whose sum is σ = 35380800. Its totient is φ = 11789856.

The previous prime is 21032357. The next prime is 21032371. The reversal of 21032361 is 16323012.

It is not a de Polignac number, because 21032361 - 2² = 21032357 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^21032361 is an apocalyptic number.

21032361 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21032361 is a deficient number, since it is larger than the sum of its proper divisors (14348439).

21032361 is a wasteful number, since it uses less digits than its factorization.

21032361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6365 (or 6362 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 21032361 is about 4586.1052103065. The cubic root of 21032361 is about 276.0340616437.

Adding to 21032361 its reverse (16323012), we get a palindrome (37355373).

The spelling of 21032361 in words is "twenty-one million, thirty-two thousand, three hundred sixty-one".