21002222210101 has 12 divisors (see below), whose sum is σ = 23881124717100. Its totient is φ = 18434552407040.

The previous prime is 21002222210033. The next prime is 21002222210161. The reversal of 21002222210101 is 10101222220012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6537093287076 + 14465128923025 = 2556774^2 + 3803305^2 .

It is not a de Polignac number, because 21002222210101 - 2¹¹ = 21002222208053 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 (21002222210161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2992618636 + ... + 2992625653.

It is an arithmetic number, because the mean of its divisors is an integer number (1990093726425).

Almost surely, 2^{21002222210101} is an apocalyptic number.

It is an amenable number.

21002222210101 is a deficient number, since it is larger than the sum of its proper divisors (2878902506999).

21002222210101 is a wasteful number, since it uses less digits than its factorization.

21002222210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5985244340 (or 5985244329 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002222210101 its reverse (10101222220012), we get a palindrome (31103444430113).

The spelling of 21002222210101 in words is "twenty-one trillion, two billion, two hundred twenty-two million, two hundred ten thousand, one hundred one".