1205340435021 has 4 divisors (see below), whose sum is σ = 1607120580032. Its totient is φ = 803560290012.

The previous prime is 1205340435017. The next prime is 1205340435059.

1205340435021 is nontrivially palindromic in base 10.

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 not a de Polignac number, because 1205340435021 - 2² = 1205340435017 is a prime.

It is a super-2 number, since 2×1205340435021² (a number of 25 digits) contains 22 as substring.

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 1205340435021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205340435011) 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, 200890072501 + ... + 200890072506.

It is an arithmetic number, because the mean of its divisors is an integer number (401780145008).

Almost surely, 2^{1205340435021} is an apocalyptic number.

It is an amenable number.

1205340435021 is a deficient number, since it is larger than the sum of its proper divisors (401780145011).

1205340435021 is an equidigital number, since it uses as much as digits as its factorization.

1205340435021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401780145010.

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 1205340435021 in words is "one trillion, two hundred five billion, three hundred forty million, four hundred thirty-five thousand, twenty-one".