21120022020101 has 4 divisors (see below), whose sum is σ = 21129886581804. Its totient is φ = 21110157458400.

The previous prime is 21120022020017. The next prime is 21120022020191. The reversal of 21120022020101 is 10102022002112.

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 14634718036225 + 6485303983876 = 3825535^2 + 2546626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120022020101 is a prime.

It is a super-2 number, since 2×21120022020101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120022020191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4932277640 + ... + 4932281921.

It is an arithmetic number, because the mean of its divisors is an integer number (5282471645451).

Almost surely, 2^{21120022020101} is an apocalyptic number.

It is an amenable number.

21120022020101 is a deficient number, since it is larger than the sum of its proper divisors (9864561703).

21120022020101 is an equidigital number, since it uses as much as digits as its factorization.

21120022020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9864561702.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21120022020101 its reverse (10102022002112), we get a palindrome (31222044022213).

The spelling of 21120022020101 in words is "twenty-one trillion, one hundred twenty billion, twenty-two million, twenty thousand, one hundred one".