20021100020206 has 4 divisors (see below), whose sum is σ = 30031650030312. Its totient is φ = 10010550010102.

The previous prime is 20021100020189. The next prime is 20021100020221. The reversal of 20021100020206 is 60202000112002.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20021100020206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005275005050 + ... + 5005275005053.

It is an arithmetic number, because the mean of its divisors is an integer number (7507912507578).

Almost surely, 2^{20021100020206} is an apocalyptic number.

20021100020206 is a deficient number, since it is larger than the sum of its proper divisors (10010550010106).

20021100020206 is a wasteful number, since it uses less digits than its factorization.

20021100020206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010550010105.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20021100020206 its reverse (60202000112002), we get a palindrome (80223100132208).

The spelling of 20021100020206 in words is "twenty trillion, twenty-one billion, one hundred million, twenty thousand, two hundred six".