21010302 has 24 divisors (see below), whose sum is σ = 46754136. Its totient is φ = 6813936.

The previous prime is 21010271. The next prime is 21010307. The reversal of 21010302 is 20301012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15108 + ... + 16439.

It is an arithmetic number, because the mean of its divisors is an integer number (1948089).

Almost surely, 2^21010302 is an apocalyptic number.

21010302 is an abundant number, since it is smaller than the sum of its proper divisors (25743834).

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

21010302 is a wasteful number, since it uses less digits than its factorization.

21010302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31592 (or 31589 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 21010302 is about 4583.6995974867. The cubic root of 21010302 is about 275.9375252419.

Adding to 21010302 its reverse (20301012), we get a palindrome (41311314).

It can be divided in two parts, 21010 and 302, that added together give a palindrome (21312).

The spelling of 21010302 in words is "twenty-one million, ten thousand, three hundred two".