212303121309 has 10 divisors (see below), whose sum is σ = 317144168990. Its totient is φ = 141535414152.

The previous prime is 212303121299. The next prime is 212303121311. The reversal of 212303121309 is 903121303212.

212303121309 is a `hidden beast` number, since 2 + 1 + 230 + 3 + 121 + 309 = 666.

It can be written as a sum of positive squares in only one way, i.e., 198911540025 + 13391581284 = 445995^2 + 115722^2 .

It is not a de Polignac number, because 212303121309 - 2⁸ = 212303121053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212303121209) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1310513014 + ... + 1310513175.

It is an arithmetic number, because the mean of its divisors is an integer number (31714416899).

Almost surely, 2^212303121309 is an apocalyptic number.

It is an amenable number.

212303121309 is a deficient number, since it is larger than the sum of its proper divisors (104841047681).

212303121309 is an equidigital number, since it uses as much as digits as its factorization.

212303121309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621026201 (or 2621026192 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The spelling of 212303121309 in words is "two hundred twelve billion, three hundred three million, one hundred twenty-one thousand, three hundred nine".