20010111210 has 80 divisors (see below), whose sum is σ = 54687149352. Its totient is φ = 5248540800.

The previous prime is 20010111203. The next prime is 20010111221. The reversal of 20010111210 is 1211101002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16073929089 + 3936182121 = 126783^2 + 62739^2 .

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 = 20010111192 and 20010111201.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 153081 + ... + 251900.

Almost surely, 2^20010111210 is an apocalyptic number.

20010111210 is an abundant number, since it is smaller than the sum of its proper divisors (34677038142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20010111210 is a wasteful number, since it uses less digits than its factorization.

20010111210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405061 (or 405052 counting only the distinct ones).

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

Adding to 20010111210 its reverse (1211101002), we get a palindrome (21221212212).

The spelling of 20010111210 in words is "twenty billion, ten million, one hundred eleven thousand, two hundred ten".