221300121 has 12 divisors (see below), whose sum is σ = 343241232. Its totient is φ = 126457128.

The previous prime is 221300063. The next prime is 221300137. The reversal of 221300121 is 121003122.

It is not a de Polignac number, because 221300121 - 2⁷ = 221299993 is a prime.

It is a super-2 number, since 2×221300121² = 97947487109229282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221300097 and 221300106.

It is not an unprimeable number, because it can be changed into a prime (221300171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 752575 + ... + 752868.

It is an arithmetic number, because the mean of its divisors is an integer number (28603436).

Almost surely, 2^221300121 is an apocalyptic number.

221300121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221300121 is a deficient number, since it is larger than the sum of its proper divisors (121941111).

221300121 is a wasteful number, since it uses less digits than its factorization.

221300121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505460 (or 1505453 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 221300121 is about 14876.1594842217. The cubic root of 221300121 is about 604.8679182556.

Adding to 221300121 its reverse (121003122), we get a palindrome (342303243).

The spelling of 221300121 in words is "two hundred twenty-one million, three hundred thousand, one hundred twenty-one".