20210220199987 has 2 divisors, whose sum is σ = 20210220199988. Its totient is φ = 20210220199986.

The previous prime is 20210220199969. The next prime is 20210220199993. The reversal of 20210220199987 is 78999102201202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20210220199987 - 2²³ = 20210211811379 is a prime.

It is not a weakly prime, because it can be changed into another prime (20210220199957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105110099993 + 10105110099994.

It is an arithmetic number, because the mean of its divisors is an integer number (10105110099994).

Almost surely, 2^{20210220199987} is an apocalyptic number.

20210220199987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210220199987 is an equidigital number, since it uses as much as digits as its factorization.

20210220199987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 52.

The spelling of 20210220199987 in words is "twenty trillion, two hundred ten billion, two hundred twenty million, one hundred ninety-nine thousand, nine hundred eighty-seven".