21213212329 has 2 divisors, whose sum is σ = 21213212330. Its totient is φ = 21213212328.

The previous prime is 21213212299. The next prime is 21213212333. The reversal of 21213212329 is 92321231212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12310346304 + 8902866025 = 110952^2 + 94355^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213212329 - 2²⁹ = 20676341417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21213212297 and 21213212306.

It is not a weakly prime, because it can be changed into another prime (21213212729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606606164 + 10606606165.

It is an arithmetic number, because the mean of its divisors is an integer number (10606606165).

Almost surely, 2^21213212329 is an apocalyptic number.

It is an amenable number.

21213212329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213212329 is an equidigital number, since it uses as much as digits as its factorization.

21213212329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The spelling of 21213212329 in words is "twenty-one billion, two hundred thirteen million, two hundred twelve thousand, three hundred twenty-nine".