1261220320213 has 8 divisors (see below), whose sum is σ = 1441926357120. Its totient is φ = 1080647209680.

The previous prime is 1261220320211. The next prime is 1261220320273. The reversal of 1261220320213 is 3120230221621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261220320213 - 2¹ = 1261220320211 is a prime.

It is a super-2 number, since 2×1261220320213² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261220320211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33211258 + ... + 33249211.

It is an arithmetic number, because the mean of its divisors is an integer number (180240794640).

Almost surely, 2^{1261220320213} is an apocalyptic number.

It is an amenable number.

1261220320213 is a deficient number, since it is larger than the sum of its proper divisors (180706036907).

1261220320213 is an equidigital number, since it uses as much as digits as its factorization.

1261220320213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66463187.

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

Adding to 1261220320213 its reverse (3120230221621), we get a palindrome (4381450541834).

The spelling of 1261220320213 in words is "one trillion, two hundred sixty-one billion, two hundred twenty million, three hundred twenty thousand, two hundred thirteen".