21363146 has 16 divisors (see below), whose sum is σ = 36697920. Its totient is φ = 9136800.

The previous prime is 21363143. The next prime is 21363149. The reversal of 21363146 is 64136312.

It is an interprime number because it is at equal distance from previous prime (21363143) and next prime (21363149).

It is not an unprimeable number, because it can be changed into a prime (21363143) 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, 7145 + ... + 9683.

It is an arithmetic number, because the mean of its divisors is an integer number (2293620).

Almost surely, 2^21363146 is an apocalyptic number.

21363146 is a deficient number, since it is larger than the sum of its proper divisors (15334774).

21363146 is a wasteful number, since it uses less digits than its factorization.

21363146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3149.

The product of its digits is 2592, while the sum is 26.

The square root of 21363146 is about 4622.0283426219. The cubic root of 21363146 is about 277.4736430341.

Adding to 21363146 its reverse (64136312), we get a palindrome (85499458).

The spelling of 21363146 in words is "twenty-one million, three hundred sixty-three thousand, one hundred forty-six".