1220201022100 has 18 divisors (see below), whose sum is σ = 2647836218174. Its totient is φ = 488080408800.

The previous prime is 1220201021993. The next prime is 1220201022133. The reversal of 1220201022100 is 12201020221.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 13292245264 + 1206908776836 = 115292^2 + 1098594^2 .

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, 6101005011 + ... + 6101005210.

Almost surely, 2^{1220201022100} is an apocalyptic number.

1220201022100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220201022100 is an abundant number, since it is smaller than the sum of its proper divisors (1427635196074).

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

1220201022100 is a wasteful number, since it uses less digits than its factorization.

1220201022100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12202010235 (or 12202010228 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1220201022100 its reverse (12201020221), we get a palindrome (1232402042321).

The spelling of 1220201022100 in words is "one trillion, two hundred twenty billion, two hundred one million, twenty-two thousand, one hundred".