21431434203202 has 4 divisors (see below), whose sum is σ = 32147151304806. Its totient is φ = 10715717101600.

The previous prime is 21431434203197. The next prime is 21431434203211. The reversal of 21431434203202 is 20230243413412.

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

It can be written as a sum of positive squares in only one way, i.e., 17000110288161 + 4431323915041 = 4123119^2 + 2105071^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5357858550799 + ... + 5357858550802.

Almost surely, 2^{21431434203202} is an apocalyptic number.

21431434203202 is a deficient number, since it is larger than the sum of its proper divisors (10715717101604).

21431434203202 is a wasteful number, since it uses less digits than its factorization.

21431434203202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10715717101603.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 21431434203202 its reverse (20230243413412), we get a palindrome (41661677616614).

The spelling of 21431434203202 in words is "twenty-one trillion, four hundred thirty-one billion, four hundred thirty-four million, two hundred three thousand, two hundred two".