22002212202221 has 4 divisors (see below), whose sum is σ = 22017068525244. Its totient is φ = 21987355879200.

The previous prime is 22002212202163. The next prime is 22002212202277. The reversal of 22002212202221 is 12220221220022.

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 17807134022500 + 4195078179721 = 4219850^2 + 2048189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22002212202221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22002212202193 and 22002212202202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22002212202121) 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, 7428159290 + ... + 7428162251.

It is an arithmetic number, because the mean of its divisors is an integer number (5504267131311).

Almost surely, 2^{22002212202221} is an apocalyptic number.

It is an amenable number.

22002212202221 is a deficient number, since it is larger than the sum of its proper divisors (14856323023).

22002212202221 is a wasteful number, since it uses less digits than its factorization.

22002212202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14856323022.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 22002212202221 its reverse (12220221220022), we get a palindrome (34222433422243).

The spelling of 22002212202221 in words is "twenty-two trillion, two billion, two hundred twelve million, two hundred two thousand, two hundred twenty-one".