2121222021101 has 4 divisors (see below), whose sum is σ = 2121511299132. Its totient is φ = 2120932743072.

The previous prime is 2121222021043. The next prime is 2121222021103. The reversal of 2121222021101 is 1011202221212.

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 433233822025 + 1687988199076 = 658205^2 + 1299226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121222021101 is a prime.

It is a super-2 number, since 2×2121222021101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121222021101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121222021103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144628016 + ... + 144642681.

It is an arithmetic number, because the mean of its divisors is an integer number (530377824783).

Almost surely, 2^{2121222021101} is an apocalyptic number.

It is an amenable number.

2121222021101 is a deficient number, since it is larger than the sum of its proper divisors (289278031).

2121222021101 is an equidigital number, since it uses as much as digits as its factorization.

2121222021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289278030.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2121222021101 its reverse (1011202221212), we get a palindrome (3132424242313).

The spelling of 2121222021101 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, one hundred one".