1210110100020 has 108 divisors (see below), whose sum is σ = 3899290348044. Its totient is φ = 303713894400.

The previous prime is 1210110100013. The next prime is 1210110100039. The reversal of 1210110100020 is 200010110121.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 6165704484 + 1203944395536 = 78522^2 + 1097244^2 .

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 = 1210110099975 and 1210110100011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11579181 + ... + 11683220.

Almost surely, 2^{1210110100020} is an apocalyptic number.

1210110100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210110100020 is an abundant number, since it is smaller than the sum of its proper divisors (2689180248024).

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

1210110100020 is a wasteful number, since it uses less digits than its factorization.

1210110100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23262450 (or 23262428 counting only the distinct ones).

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

Adding to 1210110100020 its reverse (200010110121), we get a palindrome (1410120210141).

The spelling of 1210110100020 in words is "one trillion, two hundred ten billion, one hundred ten million, one hundred thousand, twenty".