20110101210 has 96 divisors (see below), whose sum is σ = 55456876800. Its totient is φ = 5038585344.

The previous prime is 20110101199. The next prime is 20110101217. The reversal of 20110101210 is 1210101102.

It is a happy number.

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 = 20110101192 and 20110101201.

It is not an unprimeable number, because it can be changed into a prime (20110101217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 905499 + ... + 927441.

It is an arithmetic number, because the mean of its divisors is an integer number (577675800).

Almost surely, 2^20110101210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20110101210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27728438400).

20110101210 is an abundant number, since it is smaller than the sum of its proper divisors (35346775590).

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

20110101210 is a wasteful number, since it uses less digits than its factorization.

20110101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22572 (or 22569 counting only the distinct ones).

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

Adding to 20110101210 its reverse (1210101102), we get a palindrome (21320202312).

The spelling of 20110101210 in words is "twenty billion, one hundred ten million, one hundred one thousand, two hundred ten".