1306203412021 has 4 divisors (see below), whose sum is σ = 1306230168832. Its totient is φ = 1306176655212.

The previous prime is 1306203412009. The next prime is 1306203412037. The reversal of 1306203412021 is 1202143026031.

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 a de Polignac number, because none of the positive numbers 2^k-1306203412021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306203412001) 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, 13305045 + ... + 13402858.

It is an arithmetic number, because the mean of its divisors is an integer number (326557542208).

Almost surely, 2^{1306203412021} is an apocalyptic number.

It is an amenable number.

1306203412021 is a deficient number, since it is larger than the sum of its proper divisors (26756811).

1306203412021 is an equidigital number, since it uses as much as digits as its factorization.

1306203412021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26756810.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 1306203412021 its reverse (1202143026031), we get a palindrome (2508346438052).

The spelling of 1306203412021 in words is "one trillion, three hundred six billion, two hundred three million, four hundred twelve thousand, twenty-one".