21231302 has 4 divisors (see below), whose sum is σ = 31846956. Its totient is φ = 10615650.

The previous prime is 21231269. The next prime is 21231307. The reversal of 21231302 is 20313212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307824 + ... + 5307827.

It is an arithmetic number, because the mean of its divisors is an integer number (7961739).

Almost surely, 2^21231302 is an apocalyptic number.

21231302 is a deficient number, since it is larger than the sum of its proper divisors (10615654).

21231302 is a wasteful number, since it uses less digits than its factorization.

21231302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615653.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21231302 is about 4607.7436994694. The cubic root of 21231302 is about 276.9016493669.

Adding to 21231302 its reverse (20313212), we get a palindrome (41544514).

The spelling of 21231302 in words is "twenty-one million, two hundred thirty-one thousand, three hundred two".