2121029987 has 2 divisors, whose sum is σ = 2121029988. Its totient is φ = 2121029986.

The previous prime is 2121029957. The next prime is 2121030029. The reversal of 2121029987 is 7899201212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121029987 - 2⁸ = 2121029731 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121029957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060514993 + 1060514994.

It is an arithmetic number, because the mean of its divisors is an integer number (1060514994).

Almost surely, 2^2121029987 is an apocalyptic number.

2121029987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121029987 is an equidigital number, since it uses as much as digits as its factorization.

2121029987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 2121029987 is about 46054.6413187640. The cubic root of 2121029987 is about 1284.8396670967.

The spelling of 2121029987 in words is "two billion, one hundred twenty-one million, twenty-nine thousand, nine hundred eighty-seven".