2153212309 has 2 divisors, whose sum is σ = 2153212310. Its totient is φ = 2153212308.

The previous prime is 2153212289. The next prime is 2153212319. The reversal of 2153212309 is 9032123512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1959390225 + 193822084 = 44265^2 + 13922^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153212309 - 2⁷ = 2153212181 is a prime.

It is a super-2 number, since 2×2153212309² = 9272646495258222962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2153212319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076606154 + 1076606155.

It is an arithmetic number, because the mean of its divisors is an integer number (1076606155).

Almost surely, 2^2153212309 is an apocalyptic number.

It is an amenable number.

2153212309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153212309 is an equidigital number, since it uses as much as digits as its factorization.

2153212309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 2153212309 is about 46402.7187673309. The cubic root of 2153212309 is about 1291.3053527443.

The spelling of 2153212309 in words is "two billion, one hundred fifty-three million, two hundred twelve thousand, three hundred nine".