11211220120987 has 2 divisors, whose sum is σ = 11211220120988. Its totient is φ = 11211220120986.

The previous prime is 11211220120901. The next prime is 11211220121071. The reversal of 11211220120987 is 78902102211211.

11211220120987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11211220120987 - 2¹⁹ = 11211219596699 is a prime.

It is not a weakly prime, because it can be changed into another prime (11211220129987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605610060493 + 5605610060494.

It is an arithmetic number, because the mean of its divisors is an integer number (5605610060494).

Almost surely, 2^{11211220120987} is an apocalyptic number.

11211220120987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211220120987 is an equidigital number, since it uses as much as digits as its factorization.

11211220120987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 37.

The spelling of 11211220120987 in words is "eleven trillion, two hundred eleven billion, two hundred twenty million, one hundred twenty thousand, nine hundred eighty-seven".