211220011487813 has 2 divisors, whose sum is σ = 211220011487814. Its totient is φ = 211220011487812.

The previous prime is 211220011487767. The next prime is 211220011487861. The reversal of 211220011487813 is 318784110022112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197757225013924 + 13462786473889 = 14062618^2 + 3669167^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220011487813 - 2²² = 211220007293509 is a prime.

It is a super-2 number, since 2×211220011487813² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220011487873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610005743906 + 105610005743907.

It is an arithmetic number, because the mean of its divisors is an integer number (105610005743907).

Almost surely, 2^{211220011487813} is an apocalyptic number.

It is an amenable number.

211220011487813 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220011487813 is an equidigital number, since it uses as much as digits as its factorization.

211220011487813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 41.

The spelling of 211220011487813 in words is "two hundred eleven trillion, two hundred twenty billion, eleven million, four hundred eighty-seven thousand, eight hundred thirteen".