1100220121 has 16 divisors (see below), whose sum is σ = 1477219968. Its totient is φ = 791366400.

The previous prime is 1100220119. The next prime is 1100220131. The reversal of 1100220121 is 1210220011.

1100220121 = 9996² + 9997² + ... + 10006².

It is not a de Polignac number, because 1100220121 - 2¹ = 1100220119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1100220098 and 1100220107.

It is not an unprimeable number, because it can be changed into a prime (1100220131) 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, 548560 + ... + 550561.

It is an arithmetic number, because the mean of its divisors is an integer number (92326248).

Almost surely, 2^1100220121 is an apocalyptic number.

1100220121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1100220121 is a deficient number, since it is larger than the sum of its proper divisors (376999847).

1100220121 is a wasteful number, since it uses less digits than its factorization.

1100220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099152.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1100220121 is about 33169.5661864909. The cubic root of 1100220121 is about 1032.3489673886.

Adding to 1100220121 its reverse (1210220011), we get a palindrome (2310440132).

The spelling of 1100220121 in words is "one billion, one hundred million, two hundred twenty thousand, one hundred twenty-one".