21103202312 has 8 divisors (see below), whose sum is σ = 39568504350. Its totient is φ = 10551601152.

The previous prime is 21103202293. The next prime is 21103202333. The reversal of 21103202312 is 21320230112.

It can be written as a sum of positive squares in only one way, i.e., 21005864356 + 97337956 = 144934^2 + 9866^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318950137 + ... + 1318950152.

Almost surely, 2^21103202312 is an apocalyptic number.

It is an amenable number.

21103202312 is a deficient number, since it is larger than the sum of its proper divisors (18465302038).

21103202312 is a wasteful number, since it uses less digits than its factorization.

21103202312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637900295 (or 2637900291 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21103202312 its reverse (21320230112), we get a palindrome (42423432424).

The spelling of 21103202312 in words is "twenty-one billion, one hundred three million, two hundred two thousand, three hundred twelve".