1001401001220 has 24 divisors (see below), whose sum is σ = 2803922803584. Its totient is φ = 267040266976.

The previous prime is 1001401001143. The next prime is 1001401001257. The reversal of 1001401001220 is 221001041001.

It is a happy number.

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 = 1001401001196 and 1001401001205.

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, 8345008284 + ... + 8345008403.

It is an arithmetic number, because the mean of its divisors is an integer number (116830116816).

Almost surely, 2^{1001401001220} is an apocalyptic number.

1001401001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001401001220 is an abundant number, since it is smaller than the sum of its proper divisors (1802521802364).

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

1001401001220 is a wasteful number, since it uses less digits than its factorization.

1001401001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16690016699 (or 16690016697 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1001401001220 its reverse (221001041001), we get a palindrome (1222402042221).

The spelling of 1001401001220 in words is "one trillion, one billion, four hundred one million, one thousand, two hundred twenty".