10121112222221 has 64 divisors (see below), whose sum is σ = 14309584558080. Its totient is φ = 6894270339840.

The previous prime is 10121112222197. The next prime is 10121112222223. The reversal of 10121112222221 is 12222221112101.

It is not a de Polignac number, because 10121112222221 - 2¹⁸ = 10121111960077 is a prime.

It is a super-2 number, since 2×10121112222221² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10121112222193 and 10121112222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121112222223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53215331 + ... + 53405183.

It is an arithmetic number, because the mean of its divisors is an integer number (223587258720).

Almost surely, 2^{10121112222221} is an apocalyptic number.

10121112222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10121112222221 is a deficient number, since it is larger than the sum of its proper divisors (4188472335859).

10121112222221 is a wasteful number, since it uses less digits than its factorization.

10121112222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192706.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 10121112222221 its reverse (12222221112101), we get a palindrome (22343333334322).

The spelling of 10121112222221 in words is "ten trillion, one hundred twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".