2121220019987 has 2 divisors, whose sum is σ = 2121220019988. Its totient is φ = 2121220019986.

The previous prime is 2121220019923. The next prime is 2121220020041. The reversal of 2121220019987 is 7899100221212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121220019987 - 2⁶ = 2121220019923 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121220016987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060610009993 + 1060610009994.

It is an arithmetic number, because the mean of its divisors is an integer number (1060610009994).

Almost surely, 2^{2121220019987} is an apocalyptic number.

2121220019987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121220019987 is an equidigital number, since it uses as much as digits as its factorization.

2121220019987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The spelling of 2121220019987 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, nineteen thousand, nine hundred eighty-seven".