1221000020102 has 8 divisors (see below), whose sum is σ = 1831511023200. Its totient is φ = 610496345704.

The previous prime is 1221000020077. The next prime is 1221000020111. The reversal of 1221000020102 is 2010200001221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394777 + ... + 2094612.

It is an arithmetic number, because the mean of its divisors is an integer number (228938877900).

Almost surely, 2^{1221000020102} is an apocalyptic number.

1221000020102 is a deficient number, since it is larger than the sum of its proper divisors (610511003098).

1221000020102 is a wasteful number, since it uses less digits than its factorization.

1221000020102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3664350.

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

Adding to 1221000020102 its reverse (2010200001221), we get a palindrome (3231200021323).

The spelling of 1221000020102 in words is "one trillion, two hundred twenty-one billion, twenty thousand, one hundred two".