221110010121 has 128 divisors (see below), whose sum is σ = 400744415232. Its totient is φ = 104716800000.

The previous prime is 221110010113. The next prime is 221110010129. The reversal of 221110010121 is 121010011122.

It is an interprime number because it is at equal distance from previous prime (221110010113) and next prime (221110010129).

It is not a de Polignac number, because 221110010121 - 2³ = 221110010113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221110010097 and 221110010106.

It is not an unprimeable number, because it can be changed into a prime (221110010129) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 184104321 + ... + 184105521.

It is an arithmetic number, because the mean of its divisors is an integer number (3130815744).

Almost surely, 2^221110010121 is an apocalyptic number.

221110010121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221110010121 is a deficient number, since it is larger than the sum of its proper divisors (179634405111).

221110010121 is a wasteful number, since it uses less digits than its factorization.

221110010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221110010121 its reverse (121010011122), we get a palindrome (342120021243).

The spelling of 221110010121 in words is "two hundred twenty-one billion, one hundred ten million, ten thousand, one hundred twenty-one".