1020121000220 has 48 divisors (see below), whose sum is σ = 2592307488960. Its totient is φ = 329181901824.

The previous prime is 1020121000219. The next prime is 1020121000229. The reversal of 1020121000220 is 220001210201.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020121000229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214308755 + ... + 214313514.

It is an arithmetic number, because the mean of its divisors is an integer number (54006406020).

Almost surely, 2^{1020121000220} is an apocalyptic number.

1020121000220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020121000220 is an abundant number, since it is smaller than the sum of its proper divisors (1572186488740).

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

1020121000220 is a wasteful number, since it uses less digits than its factorization.

1020121000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428622302 (or 428622300 counting only the distinct ones).

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

Adding to 1020121000220 its reverse (220001210201), we get a palindrome (1240122210421).

The spelling of 1020121000220 in words is "one trillion, twenty billion, one hundred twenty-one million, two hundred twenty", and thus it is an aban number.