10121221221 has 8 divisors (see below), whose sum is σ = 13495468800. Its totient is φ = 6747227232.

The previous prime is 10121221171. The next prime is 10121221223. The reversal of 10121221221 is 12212212101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10121221221 - 2³³ = 1531286629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10121221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121221223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69580 + ... + 158378.

It is an arithmetic number, because the mean of its divisors is an integer number (1686933600).

Almost surely, 2^10121221221 is an apocalyptic number.

It is an amenable number.

10121221221 is a deficient number, since it is larger than the sum of its proper divisors (3374247579).

10121221221 is an equidigital number, since it uses as much as digits as its factorization.

10121221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126795.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 10121221221 its reverse (12212212101), we get a palindrome (22333433322).

The spelling of 10121221221 in words is "ten billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".