2157148230209 has 4 divisors (see below), whose sum is σ = 2465312263104. Its totient is φ = 1848984197316.

The previous prime is 2157148230191. The next prime is 2157148230233. The reversal of 2157148230209 is 9020328417512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2157148230209 - 2⁸ = 2157148229953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2157148230209.

It is not an unprimeable number, because it can be changed into a prime (2157148230709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154082016437 + ... + 154082016450.

It is an arithmetic number, because the mean of its divisors is an integer number (616328065776).

Almost surely, 2^{2157148230209} is an apocalyptic number.

It is an amenable number.

2157148230209 is a deficient number, since it is larger than the sum of its proper divisors (308164032895).

2157148230209 is an equidigital number, since it uses as much as digits as its factorization.

2157148230209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308164032894.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 2157148230209 in words is "two trillion, one hundred fifty-seven billion, one hundred forty-eight million, two hundred thirty thousand, two hundred nine".