1221210202100 has 36 divisors (see below), whose sum is σ = 3028601302944. Its totient is φ = 418700640480.

The previous prime is 1221210202081. The next prime is 1221210202117. The reversal of 1221210202100 is 12020121221.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 872292302 + ... + 872293701.

Almost surely, 2^{1221210202100} is an apocalyptic number.

1221210202100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221210202100 is an abundant number, since it is smaller than the sum of its proper divisors (1807391100844).

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

1221210202100 is a wasteful number, since it uses less digits than its factorization.

1221210202100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744586024 (or 1744586017 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221210202100 its reverse (12020121221), we get a palindrome (1233230323321).

The spelling of 1221210202100 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, two hundred two thousand, one hundred".