1220101002100 has 18 divisors (see below), whose sum is σ = 2647619174774. Its totient is φ = 488040400800.

The previous prime is 1220101002079. The next prime is 1220101002101. The reversal of 1220101002100 is 12001010221.

It can be written as a sum of positive squares in 3 ways, for example, as 220604938596 + 999496063504 = 469686^2 + 999748^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220101002101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6100504911 + ... + 6100505110.

Almost surely, 2^{1220101002100} is an apocalyptic number.

1220101002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220101002100 is an abundant number, since it is smaller than the sum of its proper divisors (1427518172674).

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

1220101002100 is a wasteful number, since it uses less digits than its factorization.

1220101002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12201010035 (or 12201010028 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1220101002100 its reverse (12001010221), we get a palindrome (1232102012321).

The spelling of 1220101002100 in words is "one trillion, two hundred twenty billion, one hundred one million, two thousand, one hundred".