21202420213 has 8 divisors (see below), whose sum is σ = 24176515608. Its totient is φ = 18420201984.

The previous prime is 21202420157. The next prime is 21202420243. The reversal of 21202420213 is 31202420212.

It can be written as a sum of positive squares in 4 ways, for example, as 2906611569 + 18295808644 = 53913^2 + 135262^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21202420213 - 2²⁹ = 20665549301 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 (21202420243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47969056 + ... + 47969497.

It is an arithmetic number, because the mean of its divisors is an integer number (3022064451).

Almost surely, 2^21202420213 is an apocalyptic number.

It is an amenable number.

21202420213 is a deficient number, since it is larger than the sum of its proper divisors (2974095395).

21202420213 is a wasteful number, since it uses less digits than its factorization.

21202420213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95938583.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21202420213 its reverse (31202420212), we get a palindrome (52404840425).

Subtracting 21202420213 from its reverse (31202420212), we obtain a palindrome (9999999999).

The spelling of 21202420213 in words is "twenty-one billion, two hundred two million, four hundred twenty thousand, two hundred thirteen".