10211221000121 has 4 divisors (see below), whose sum is σ = 10312322198244. Its totient is φ = 10110119802000.

The previous prime is 10211221000111. The next prime is 10211221000139. The reversal of 10211221000121 is 12100012211201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8260226631721 + 1950994368400 = 2874061^2 + 1396780^2 .

It is a cyclic number.

It is not a de Polignac number, because 10211221000121 - 2¹⁴ = 10211220983737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10211221000096 and 10211221000105.

It is not an unprimeable number, because it can be changed into a prime (10211221000111) 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, 50550598910 + ... + 50550599111.

It is an arithmetic number, because the mean of its divisors is an integer number (2578080549561).

Almost surely, 2^{10211221000121} is an apocalyptic number.

It is an amenable number.

10211221000121 is a deficient number, since it is larger than the sum of its proper divisors (101101198123).

10211221000121 is a wasteful number, since it uses less digits than its factorization.

10211221000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101101198122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 10211221000121 its reverse (12100012211201), we get a palindrome (22311233211322).

The spelling of 10211221000121 in words is "ten trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.