20111111002 has 4 divisors (see below), whose sum is σ = 30166666506. Its totient is φ = 10055555500.

The previous prime is 20111110997. The next prime is 20111111003. The reversal of 20111111002 is 20011111102.

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., 15323716521 + 4787394481 = 123789^2 + 69191^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20111111002.

It is not an unprimeable number, because it can be changed into a prime (20111111003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5027777749 + ... + 5027777752.

Almost surely, 2^20111111002 is an apocalyptic number.

20111111002 is a deficient number, since it is larger than the sum of its proper divisors (10055555504).

20111111002 is a wasteful number, since it uses less digits than its factorization.

20111111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10055555503.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20111111002 its reverse (20011111102), we get a palindrome (40122222104).

It can be divided in two parts, 2011111100 and 2, that added together give a palindrome (2011111102).

The spelling of 20111111002 in words is "twenty billion, one hundred eleven million, one hundred eleven thousand, two".