10121012221 has 4 divisors (see below), whose sum is σ = 10188038944. Its totient is φ = 10053985500.

The previous prime is 10121012177. The next prime is 10121012233. The reversal of 10121012221 is 12221012101.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12221012101 = 71 ⋅172126931.

It is a cyclic number.

It is not a de Polignac number, because 10121012221 - 2¹³ = 10121004029 is a prime.

It is a super-3 number, since 3×10121012221³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121012521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33513135 + ... + 33513436.

It is an arithmetic number, because the mean of its divisors is an integer number (2547009736).

Almost surely, 2^10121012221 is an apocalyptic number.

It is an amenable number.

10121012221 is a deficient number, since it is larger than the sum of its proper divisors (67026723).

10121012221 is an equidigital number, since it uses as much as digits as its factorization.

10121012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67026722.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10121012221 its reverse (12221012101), we get a palindrome (22342024322).

The spelling of 10121012221 in words is "ten billion, one hundred twenty-one million, twelve thousand, two hundred twenty-one".