22001101010221 has 4 divisors (see below), whose sum is σ = 22019419996444. Its totient is φ = 21982782024000.

The previous prime is 22001101010177. The next prime is 22001101010227. The reversal of 22001101010221 is 12201010110022.

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 31679016196 + 21969421994025 = 177986^2 + 4687155^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001101010221 - 2²¹ = 22001098913069 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 (22001101010227) 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, 9159491310 + ... + 9159493711.

It is an arithmetic number, because the mean of its divisors is an integer number (5504854999111).

Almost surely, 2^{22001101010221} is an apocalyptic number.

It is an amenable number.

22001101010221 is a deficient number, since it is larger than the sum of its proper divisors (18318986223).

22001101010221 is a wasteful number, since it uses less digits than its factorization.

22001101010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18318986222.

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

Adding to 22001101010221 its reverse (12201010110022), we get a palindrome (34202111120243).

The spelling of 22001101010221 in words is "twenty-two trillion, one billion, one hundred one million, ten thousand, two hundred twenty-one".