221200011020121 has 32 divisors (see below), whose sum is σ = 340051803985920. Its totient is φ = 125280600770304.

The previous prime is 221200011020003. The next prime is 221200011020179. The reversal of 221200011020121 is 121020110002122.

It is not a de Polignac number, because 221200011020121 - 2²³ = 221200002631513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221200011020121.

It is not an unprimeable number, because it can be changed into a prime (221200011022121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 694557906 + ... + 694876308.

It is an arithmetic number, because the mean of its divisors is an integer number (10626618874560).

Almost surely, 2^{221200011020121} is an apocalyptic number.

221200011020121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221200011020121 is a deficient number, since it is larger than the sum of its proper divisors (118851792965799).

221200011020121 is a wasteful number, since it uses less digits than its factorization.

221200011020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611285.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221200011020121 its reverse (121020110002122), we get a palindrome (342220121022243).

The spelling of 221200011020121 in words is "two hundred twenty-one trillion, two hundred billion, eleven million, twenty thousand, one hundred twenty-one".