1221020102000 has 80 divisors (see below), whose sum is σ = 2954216415072. Its totient is φ = 488111961600.

The previous prime is 1221020101999. The next prime is 1221020102017. The reversal of 1221020102000 is 2010201221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3129779 + ... + 3498221.

Almost surely, 2^{1221020102000} is an apocalyptic number.

1221020102000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221020102000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1477108207536).

1221020102000 is an abundant number, since it is smaller than the sum of its proper divisors (1733196313072).

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

1221020102000 is a wasteful number, since it uses less digits than its factorization.

1221020102000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370123 (or 370107 counting only the distinct ones).

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

Adding to 1221020102000 its reverse (2010201221), we get a palindrome (1223030303221).

It can be divided in two parts, 12 and 21020102000, that added together give a palindrome (21020102012).

The spelling of 1221020102000 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred two thousand".