1221020020102 has 16 divisors (see below), whose sum is σ = 1863033422400. Its totient is φ = 600013996200.

The previous prime is 1221020020007. The next prime is 1221020020127. The reversal of 1221020020102 is 2010200201221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 799152 + ... + 1755187.

It is an arithmetic number, because the mean of its divisors is an integer number (116439588900).

Almost surely, 2^{1221020020102} is an apocalyptic number.

1221020020102 is a deficient number, since it is larger than the sum of its proper divisors (642013402298).

1221020020102 is a wasteful number, since it uses less digits than its factorization.

1221020020102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558451.

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

Adding to 1221020020102 its reverse (2010200201221), we get a palindrome (3231220221323).

The spelling of 1221020020102 in words is "one trillion, two hundred twenty-one billion, twenty million, twenty thousand, one hundred two".