2013212305721 has 2 divisors, whose sum is σ = 2013212305722. Its totient is φ = 2013212305720.

The previous prime is 2013212305649. The next prime is 2013212305729. The reversal of 2013212305721 is 1275032123102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1976102136121 + 37110169600 = 1405739^2 + 192640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2013212305721 is a prime.

It is not a weakly prime, because it can be changed into another prime (2013212305729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006606152860 + 1006606152861.

It is an arithmetic number, because the mean of its divisors is an integer number (1006606152861).

Almost surely, 2^{2013212305721} is an apocalyptic number.

It is an amenable number.

2013212305721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2013212305721 is an equidigital number, since it uses as much as digits as its factorization.

2013212305721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

Adding to 2013212305721 its reverse (1275032123102), we get a palindrome (3288244428823).

The spelling of 2013212305721 in words is "two trillion, thirteen billion, two hundred twelve million, three hundred five thousand, seven hundred twenty-one".