21421300213 has 2 divisors, whose sum is σ = 21421300214. Its totient is φ = 21421300212.

The previous prime is 21421300151. The next prime is 21421300223. The reversal of 21421300213 is 31200312412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21416273649 + 5026564 = 146343^2 + 2242^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21421300213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21421300223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710650106 + 10710650107.

It is an arithmetic number, because the mean of its divisors is an integer number (10710650107).

Almost surely, 2^21421300213 is an apocalyptic number.

It is an amenable number.

21421300213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21421300213 is an equidigital number, since it uses as much as digits as its factorization.

21421300213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21421300213 its reverse (31200312412), we get a palindrome (52621612625).

The spelling of 21421300213 in words is "twenty-one billion, four hundred twenty-one million, three hundred thousand, two hundred thirteen".