121121222202101 has 6 divisors (see below), whose sum is σ = 133133244238806. Its totient is φ = 110110202001800.

The previous prime is 121121222202067. The next prime is 121121222202119. The reversal of 121121222202101 is 101202222121121.

It can be written as a sum of positive squares in only one way, i.e., 120441867109201 + 679355092900 = 10974601^2 + 824230^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121121222202101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121222202191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 500500918070 + ... + 500500918311.

It is an arithmetic number, because the mean of its divisors is an integer number (22188874039801).

Almost surely, 2^{121121222202101} is an apocalyptic number.

121121222202101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121121222202101 is a deficient number, since it is larger than the sum of its proper divisors (12012022036705).

121121222202101 is a wasteful number, since it uses less digits than its factorization.

121121222202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001001836403 (or 1001001836392 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121121222202101 its reverse (101202222121121), we get a palindrome (222323444323222).

It can be divided in two parts, 121121 and 222202101, that added together give a palindrome (222323222).

The spelling of 121121222202101 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred two thousand, one hundred one".