1220001202100 has 18 divisors (see below), whose sum is σ = 2647402608774. Its totient is φ = 488000480800.

The previous prime is 1220001202067. The next prime is 1220001202117. The reversal of 1220001202100 is 12021000221.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 818646544 + 1219182555556 = 28612^2 + 1104166^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6100005911 + ... + 6100006110.

Almost surely, 2^{1220001202100} is an apocalyptic number.

1220001202100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220001202100 is an abundant number, since it is smaller than the sum of its proper divisors (1427401406674).

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

1220001202100 is a wasteful number, since it uses less digits than its factorization.

1220001202100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12200012035 (or 12200012028 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1220001202100 its reverse (12021000221), we get a palindrome (1232022202321).

The spelling of 1220001202100 in words is "one trillion, two hundred twenty billion, one million, two hundred two thousand, one hundred".