11211220211969 has 2 divisors, whose sum is σ = 11211220211970. Its totient is φ = 11211220211968.

The previous prime is 11211220211941. The next prime is 11211220212007. The reversal of 11211220211969 is 96911202211211.

It is an a-pointer prime, because the next prime (11211220212007) can be obtained adding 11211220211969 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10939688550400 + 271531661569 = 3307520^2 + 521087^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211220211969 - 2³² = 11206925244673 is a prime.

It is a super-2 number, since 2×11211220211969² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11211220211929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605610105984 + 5605610105985.

It is an arithmetic number, because the mean of its divisors is an integer number (5605610105985).

Almost surely, 2^{11211220211969} is an apocalyptic number.

It is an amenable number.

11211220211969 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211220211969 is an equidigital number, since it uses as much as digits as its factorization.

11211220211969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 38.

The spelling of 11211220211969 in words is "eleven trillion, two hundred eleven billion, two hundred twenty million, two hundred eleven thousand, nine hundred sixty-nine".