1021121020220 has 48 divisors (see below), whose sum is σ = 2452239111168. Its totient is φ = 349877398080.

The previous prime is 1021121020193. The next prime is 1021121020223. The reversal of 1021121020220 is 220201211201.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1021121020195 and 1021121020204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021121020223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2082146 + ... + 2525385.

It is an arithmetic number, because the mean of its divisors is an integer number (51088314816).

Almost surely, 2^{1021121020220} is an apocalyptic number.

1021121020220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021121020220 is an abundant number, since it is smaller than the sum of its proper divisors (1431118090948).

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

1021121020220 is a wasteful number, since it uses less digits than its factorization.

1021121020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4609130 (or 4609128 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1021121020220 its reverse (220201211201), we get a palindrome (1241322231421).

The spelling of 1021121020220 in words is "one trillion, twenty-one billion, one hundred twenty-one million, twenty thousand, two hundred twenty".