10100121111221 has 4 divisors (see below), whose sum is σ = 10200122310444. Its totient is φ = 10000119912000.

The previous prime is 10100121111203. The next prime is 10100121111259. The reversal of 10100121111221 is 12211112100101.

10100121111221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 7662853730596 + 2437267380625 = 2768186^2 + 1561175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10100121111221 is a prime.

It is a super-2 number, since 2×10100121111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10100121111196 and 10100121111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10100121191221) 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, 50000599460 + ... + 50000599661.

It is an arithmetic number, because the mean of its divisors is an integer number (2550030577611).

Almost surely, 2^{10100121111221} is an apocalyptic number.

It is an amenable number.

10100121111221 is a deficient number, since it is larger than the sum of its proper divisors (100001199223).

10100121111221 is a wasteful number, since it uses less digits than its factorization.

10100121111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100001199222.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 10100121111221 its reverse (12211112100101), we get a palindrome (22311233211322).

The spelling of 10100121111221 in words is "ten trillion, one hundred billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".