21136302 has 80 divisors (see below), whose sum is σ = 53578800. Its totient is φ = 6168960.

The previous prime is 21136277. The next prime is 21136319. The reversal of 21136302 is 20363112.

21136302 is a `hidden beast` number, since 21 + 13 + 630 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 51474 + ... + 51882.

It is an arithmetic number, because the mean of its divisors is an integer number (669735).

Almost surely, 2^21136302 is an apocalyptic number.

21136302 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21136302, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26789400).

21136302 is an abundant number, since it is smaller than the sum of its proper divisors (32442498).

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

21136302 is a wasteful number, since it uses less digits than its factorization.

21136302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 454 counting only the distinct ones).

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

The square root of 21136302 is about 4597.4234088237. The cubic root of 21136302 is about 276.4880306822.

Adding to 21136302 its reverse (20363112), we get a palindrome (41499414).

The spelling of 21136302 in words is "twenty-one million, one hundred thirty-six thousand, three hundred two".