21210213511 has 2 divisors, whose sum is σ = 21210213512. Its totient is φ = 21210213510.

The previous prime is 21210213499. The next prime is 21210213553. The reversal of 21210213511 is 11531201212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210213511 - 2²¹ = 21208116359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210214511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605106755 + 10605106756.

It is an arithmetic number, because the mean of its divisors is an integer number (10605106756).

Almost surely, 2^21210213511 is an apocalyptic number.

21210213511 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210213511 is an equidigital number, since it uses as much as digits as its factorization.

21210213511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 21210213511 its reverse (11531201212), we get a palindrome (32741414723).

The spelling of 21210213511 in words is "twenty-one billion, two hundred ten million, two hundred thirteen thousand, five hundred eleven".