10121122212221 has 4 divisors (see below), whose sum is σ = 10122894433344. Its totient is φ = 10119349991100.

The previous prime is 10121122212217. The next prime is 10121122212277. The reversal of 10121122212221 is 12221222112101.

10121122212221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10121122212221 - 2² = 10121122212217 is a prime.

It is a super-2 number, since 2×10121122212221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10121122212193 and 10121122212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121122212211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 886101995 + ... + 886113416.

It is an arithmetic number, because the mean of its divisors is an integer number (2530723608336).

Almost surely, 2^{10121122212221} is an apocalyptic number.

It is an amenable number.

10121122212221 is a deficient number, since it is larger than the sum of its proper divisors (1772221123).

10121122212221 is an equidigital number, since it uses as much as digits as its factorization.

10121122212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772221122.

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

Adding to 10121122212221 its reverse (12221222112101), we get a palindrome (22342344324322).

The spelling of 10121122212221 in words is "ten trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".