21212013299 has 2 divisors, whose sum is σ = 21212013300. Its totient is φ = 21212013298.

The previous prime is 21212013287. The next prime is 21212013323. The reversal of 21212013299 is 99231021212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212013299 - 2¹⁶ = 21211947763 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212013499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606006649 + 10606006650.

It is an arithmetic number, because the mean of its divisors is an integer number (10606006650).

Almost surely, 2^21212013299 is an apocalyptic number.

21212013299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212013299 is an equidigital number, since it uses as much as digits as its factorization.

21212013299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 21212013299 in words is "twenty-one billion, two hundred twelve million, thirteen thousand, two hundred ninety-nine".