20211020002 has 4 divisors (see below), whose sum is σ = 30316530006. Its totient is φ = 10105510000.

The previous prime is 20211019991. The next prime is 20211020021. The reversal of 20211020002 is 20002011202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20002011202 = 2 ⋅10001005601.

It can be written as a sum of positive squares in only one way, i.e., 17699907681 + 2511112321 = 133041^2 + 50111^2 .

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, 5052754999 + ... + 5052755002.

Almost surely, 2^20211020002 is an apocalyptic number.

20211020002 is a deficient number, since it is larger than the sum of its proper divisors (10105510004).

20211020002 is a wasteful number, since it uses less digits than its factorization.

20211020002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10105510003.

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

Adding to 20211020002 its reverse (20002011202), we get a palindrome (40213031204).

The spelling of 20211020002 in words is "twenty billion, two hundred eleven million, twenty thousand, two".