21110364 has 36 divisors (see below), whose sum is σ = 58214520. Its totient is φ = 6396960.

The previous prime is 21110363. The next prime is 21110381. The reversal of 21110364 is 46301112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26259 + ... + 27050.

It is an arithmetic number, because the mean of its divisors is an integer number (1617070).

Almost surely, 2^21110364 is an apocalyptic number.

It is an amenable number.

21110364 is an abundant number, since it is smaller than the sum of its proper divisors (37104156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21110364 is a wasteful number, since it uses less digits than its factorization.

21110364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53330 (or 53325 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21110364 is about 4594.6016149390. The cubic root of 21110364 is about 276.3748843975.

Adding to 21110364 its reverse (46301112), we get a palindrome (67411476).

The spelling of 21110364 in words is "twenty-one million, one hundred ten thousand, three hundred sixty-four".