10121220001221 has 96 divisors (see below), whose sum is σ = 16408248912000. Its totient is φ = 5526231879168.

The previous prime is 10121220001181. The next prime is 10121220001253. The reversal of 10121220001221 is 12210002212101.

It is not a de Polignac number, because 10121220001221 - 2⁷ = 10121220001093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10121220001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121220021221) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 399136275 + ... + 399161631.

It is an arithmetic number, because the mean of its divisors is an integer number (170919259500).

Almost surely, 2^{10121220001221} is an apocalyptic number.

It is an amenable number.

10121220001221 is a deficient number, since it is larger than the sum of its proper divisors (6287028910779).

10121220001221 is a wasteful number, since it uses less digits than its factorization.

10121220001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26371 (or 26364 counting only the distinct ones).

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

Adding to 10121220001221 its reverse (12210002212101), we get a palindrome (22331222213322).

The spelling of 10121220001221 in words is "ten trillion, one hundred twenty-one billion, two hundred twenty million, one thousand, two hundred twenty-one".