20001210111 has 12 divisors (see below), whose sum is σ = 30411196920. Its totient is φ = 12632343120.

The previous prime is 20001210101. The next prime is 20001210133. The reversal of 20001210111 is 11101210002.

It is a happy number.

It is not a de Polignac number, because 20001210111 - 2¹⁴ = 20001193727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20001210093 and 20001210102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001210101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58482900 + ... + 58483241.

It is an arithmetic number, because the mean of its divisors is an integer number (2534266410).

Almost surely, 2^20001210111 is an apocalyptic number.

20001210111 is a deficient number, since it is larger than the sum of its proper divisors (10409986809).

20001210111 is a wasteful number, since it uses less digits than its factorization.

20001210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116966166 (or 116966163 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20001210111 its reverse (11101210002), we get a palindrome (31102420113).

The spelling of 20001210111 in words is "twenty billion, one million, two hundred ten thousand, one hundred eleven".