20010002111 has 4 divisors (see below), whose sum is σ = 21829093224. Its totient is φ = 18190911000.

The previous prime is 20010002107. The next prime is 20010002113. The reversal of 20010002111 is 11120001002.

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 20010002111 - 2² = 20010002107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010002113) 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, 909545540 + ... + 909545561.

It is an arithmetic number, because the mean of its divisors is an integer number (5457273306).

Almost surely, 2^20010002111 is an apocalyptic number.

20010002111 is a deficient number, since it is larger than the sum of its proper divisors (1819091113).

20010002111 is a wasteful number, since it uses less digits than its factorization.

20010002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819091112.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20010002111 its reverse (11120001002), we get a palindrome (31130003113).

The spelling of 20010002111 in words is "twenty billion, ten million, two thousand, one hundred eleven".