1001101220 has 48 divisors (see below), whose sum is σ = 2507113728. Its totient is φ = 328310400.

The previous prime is 1001101217. The next prime is 1001101261. The reversal of 1001101220 is 221011001.

It is a junction number, because it is equal to n+sod(n) for n = 1001101198 and 1001101207.

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, 152231 + ... + 158670.

It is an arithmetic number, because the mean of its divisors is an integer number (52231536).

Almost surely, 2^1001101220 is an apocalyptic number.

1001101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001101220 is an abundant number, since it is smaller than the sum of its proper divisors (1506012508).

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

1001101220 is a wasteful number, since it uses less digits than its factorization.

1001101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310940 (or 310938 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1001101220 is about 31640.1836277857. The cubic root of 1001101220 is about 1000.3669386729.

Adding to 1001101220 its reverse (221011001), we get a palindrome (1222112221).

The spelling of 1001101220 in words is "one billion, one million, one hundred one thousand, two hundred twenty".