21203220213 has 12 divisors (see below), whose sum is σ = 35002141408. Its totient is φ = 12116125800.

The previous prime is 21203220211. The next prime is 21203220239. The reversal of 21203220213 is 31202230212.

It is not a de Polignac number, because 21203220213 - 2¹ = 21203220211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203220211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168279463 + ... + 168279588.

Almost surely, 2^21203220213 is an apocalyptic number.

It is an amenable number.

21203220213 is a deficient number, since it is larger than the sum of its proper divisors (13798921195).

21203220213 is a wasteful number, since it uses less digits than its factorization.

21203220213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336559064 (or 336559061 counting only the distinct ones).

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

Adding to 21203220213 its reverse (31202230212), we get a palindrome (52405450425).

Subtracting 21203220213 from its reverse (31202230212), we obtain a palindrome (9999009999).

The spelling of 21203220213 in words is "twenty-one billion, two hundred three million, two hundred twenty thousand, two hundred thirteen".