1201221211020 has 48 divisors (see below), whose sum is σ = 3363468470880. Its totient is φ = 320320982016.

The previous prime is 1201221211009. The next prime is 1201221211031. The reversal of 1201221211020 is 201121221021.

It is an interprime number because it is at equal distance from previous prime (1201221211009) and next prime (1201221211031).

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 6496164 + ... + 6678516.

It is an arithmetic number, because the mean of its divisors is an integer number (70072259810).

Almost surely, 2^{1201221211020} is an apocalyptic number.

1201221211020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201221211020 is an abundant number, since it is smaller than the sum of its proper divisors (2162247259860).

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

1201221211020 is a wasteful number, since it uses less digits than its factorization.

1201221211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292154 (or 292152 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1201221211020 its reverse (201121221021), we get a palindrome (1402342432041).

The spelling of 1201221211020 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two hundred eleven thousand, twenty".