21431202213 has 16 divisors (see below), whose sum is σ = 28951445376. Its totient is φ = 14100049920.

The previous prime is 21431202203. The next prime is 21431202251. The reversal of 21431202213 is 31220213412.

It is not a de Polignac number, because 21431202213 - 2¹³ = 21431194021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21431202213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431202203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1593 + ... + 207038.

It is an arithmetic number, because the mean of its divisors is an integer number (1809465336).

Almost surely, 2^21431202213 is an apocalyptic number.

It is an amenable number.

21431202213 is a deficient number, since it is larger than the sum of its proper divisors (7520243163).

21431202213 is a wasteful number, since it uses less digits than its factorization.

21431202213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209084.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21431202213 its reverse (31220213412), we get a palindrome (52651415625).

The spelling of 21431202213 in words is "twenty-one billion, four hundred thirty-one million, two hundred two thousand, two hundred thirteen".