10121131221 has 16 divisors (see below), whose sum is σ = 13544133120. Its totient is φ = 6722818560.

The previous prime is 10121131217. The next prime is 10121131243. The reversal of 10121131221 is 12213112101.

It is not a de Polignac number, because 10121131221 - 2² = 10121131217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10121131221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121131201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1046076 + ... + 1055706.

It is an arithmetic number, because the mean of its divisors is an integer number (846508320).

Almost surely, 2^10121131221 is an apocalyptic number.

It is an amenable number.

10121131221 is a deficient number, since it is larger than the sum of its proper divisors (3423001899).

10121131221 is an equidigital number, since it uses as much as digits as its factorization.

10121131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10876.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 10121131221 its reverse (12213112101), we get a palindrome (22334243322).

The spelling of 10121131221 in words is "ten billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty-one".