1001021111220 has 48 divisors (see below), whose sum is σ = 3018463660800. Its totient is φ = 246405196416.

The previous prime is 1001021111219. The next prime is 1001021111221. The reversal of 1001021111220 is 221111201001.

1001021111220 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1001021111219) and next prime (1001021111221).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1001021111196 and 1001021111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001021111221) 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, 641679420 + ... + 641680979.

It is an arithmetic number, because the mean of its divisors is an integer number (62884659600).

Almost surely, 2^{1001021111220} is an apocalyptic number.

1001021111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001021111220 is an abundant number, since it is smaller than the sum of its proper divisors (2017442549580).

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

1001021111220 is a wasteful number, since it uses less digits than its factorization.

1001021111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283360424 (or 1283360422 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1001021111220 its reverse (221111201001), we get a palindrome (1222132312221).

The spelling of 1001021111220 in words is "one trillion, one billion, twenty-one million, one hundred eleven thousand, two hundred twenty".