22101021100021 has 4 divisors (see below), whose sum is σ = 22130063178444. Its totient is φ = 22071979021600.

The previous prime is 22101021100009. The next prime is 22101021100051. The reversal of 22101021100021 is 12000112010122.

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 10516432839025 + 11584588260996 = 3242905^2 + 3403614^2 .

It is a cyclic number.

It is not a de Polignac number, because 22101021100021 - 2¹¹ = 22101021097973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22101021099974 and 22101021100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101021100001) 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, 14521038070 + ... + 14521039591.

It is an arithmetic number, because the mean of its divisors is an integer number (5532515794611).

Almost surely, 2^{22101021100021} is an apocalyptic number.

It is an amenable number.

22101021100021 is a deficient number, since it is larger than the sum of its proper divisors (29042078423).

22101021100021 is an equidigital number, since it uses as much as digits as its factorization.

22101021100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29042078422.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 22101021100021 its reverse (12000112010122), we get a palindrome (34101133110143).

The spelling of 22101021100021 in words is "twenty-two trillion, one hundred one billion, twenty-one million, one hundred thousand, twenty-one".