202021102121987 has 2 divisors, whose sum is σ = 202021102121988. Its totient is φ = 202021102121986.

The previous prime is 202021102121983. The next prime is 202021102122053. The reversal of 202021102121987 is 789121201120202.

202021102121987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 202021102121987 - 2² = 202021102121983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202021102121987.

It is not a weakly prime, because it can be changed into another prime (202021102121983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101010551060993 + 101010551060994.

It is an arithmetic number, because the mean of its divisors is an integer number (101010551060994).

Almost surely, 2^{202021102121987} is an apocalyptic number.

202021102121987 is a deficient number, since it is larger than the sum of its proper divisors (1).

202021102121987 is an equidigital number, since it uses as much as digits as its factorization.

202021102121987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 38.

The spelling of 202021102121987 in words is "two hundred two trillion, twenty-one billion, one hundred two million, one hundred twenty-one thousand, nine hundred eighty-seven".