20211002002 has 4 divisors (see below), whose sum is σ = 30316503006. Its totient is φ = 10105501000.

The previous prime is 20211001981. The next prime is 20211002047. The reversal of 20211002002 is 20020011202.

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

It can be written as a sum of positive squares in only one way, i.e., 20021967001 + 189035001 = 141499^2 + 13749^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20211002002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5052750499 + ... + 5052750502.

Almost surely, 2^20211002002 is an apocalyptic number.

20211002002 is a deficient number, since it is larger than the sum of its proper divisors (10105501004).

20211002002 is a wasteful number, since it uses less digits than its factorization.

20211002002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10105501003.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20211002002 its reverse (20020011202), we get a palindrome (40231013204).

The spelling of 20211002002 in words is "twenty billion, two hundred eleven million, two thousand, two".