202021201987 has 4 divisors (see below), whose sum is σ = 220386765816. Its totient is φ = 183655638160.

The previous prime is 202021201933. The next prime is 202021201997. The reversal of 202021201987 is 789102120202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 202021201987 - 2¹⁵ = 202021169219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202021201997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9182781898 + ... + 9182781919.

It is an arithmetic number, because the mean of its divisors is an integer number (55096691454).

Almost surely, 2^202021201987 is an apocalyptic number.

202021201987 is a deficient number, since it is larger than the sum of its proper divisors (18365563829).

202021201987 is a wasteful number, since it uses less digits than its factorization.

202021201987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18365563828.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 202021201987 in words is "two hundred two billion, twenty-one million, two hundred one thousand, nine hundred eighty-seven".