21243231302 has 4 divisors (see below), whose sum is σ = 31864846956. Its totient is φ = 10621615650.

The previous prime is 21243231299. The next prime is 21243231341. The reversal of 21243231302 is 20313234212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310807824 + ... + 5310807827.

It is an arithmetic number, because the mean of its divisors is an integer number (7966211739).

Almost surely, 2^21243231302 is an apocalyptic number.

21243231302 is a deficient number, since it is larger than the sum of its proper divisors (10621615654).

21243231302 is a wasteful number, since it uses less digits than its factorization.

21243231302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10621615653.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21243231302 its reverse (20313234212), we get a palindrome (41556465514).

The spelling of 21243231302 in words is "twenty-one billion, two hundred forty-three million, two hundred thirty-one thousand, three hundred two".