21403310202 has 12 divisors (see below), whose sum is σ = 46373838810. Its totient is φ = 7134436728.

The previous prime is 21403310189. The next prime is 21403310219. The reversal of 21403310202 is 20201330412.

It can be written as a sum of positive squares in only one way, i.e., 20612632041 + 790678161 = 143571^2 + 28119^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1189072789 = 21403310202 / (2 + 1 + 4 + 0 + 3 + 3 + 1 + 0 + 2 + 0 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 594536377 + ... + 594536412.

Almost surely, 2^21403310202 is an apocalyptic number.

21403310202 is an abundant number, since it is smaller than the sum of its proper divisors (24970528608).

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

21403310202 is a wasteful number, since it uses less digits than its factorization.

21403310202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189072797 (or 1189072794 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21403310202 its reverse (20201330412), we get a palindrome (41604640614).

The spelling of 21403310202 in words is "twenty-one billion, four hundred three million, three hundred ten thousand, two hundred two".