21031302 has 16 divisors (see below), whose sum is σ = 42181632. Its totient is φ = 6990600.

The previous prime is 21031291. The next prime is 21031303. The reversal of 21031302 is 20313012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031303) 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, 2574 + ... + 6977.

It is an arithmetic number, because the mean of its divisors is an integer number (2636352).

Almost surely, 2^21031302 is an apocalyptic number.

21031302 is an abundant number, since it is smaller than the sum of its proper divisors (21150330).

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

21031302 is a wasteful number, since it uses less digits than its factorization.

21031302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9923.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21031302 is about 4585.9897514059. The cubic root of 21031302 is about 276.0294287041.

Adding to 21031302 its reverse (20313012), we get a palindrome (41344314).

The spelling of 21031302 in words is "twenty-one million, thirty-one thousand, three hundred two".