1205211145321 has 4 divisors (see below), whose sum is σ = 1209136914832. Its totient is φ = 1201285375812.

The previous prime is 1205211145297. The next prime is 1205211145337. The reversal of 1205211145321 is 1235411125021.

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 1205211145321 - 2¹⁹ = 1205210621033 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 1205211145321.

It is not an unprimeable number, because it can be changed into a prime (1205211145121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1962884295 + ... + 1962884908.

It is an arithmetic number, because the mean of its divisors is an integer number (302284228708).

Almost surely, 2^{1205211145321} is an apocalyptic number.

It is an amenable number.

1205211145321 is a deficient number, since it is larger than the sum of its proper divisors (3925769511).

1205211145321 is an equidigital number, since it uses as much as digits as its factorization.

1205211145321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3925769510.

The product of its (nonzero) digits is 2400, while the sum is 28.

The spelling of 1205211145321 in words is "one trillion, two hundred five billion, two hundred eleven million, one hundred forty-five thousand, three hundred twenty-one".