21212020222303 has 2 divisors, whose sum is σ = 21212020222304. Its totient is φ = 21212020222302.

The previous prime is 21212020222273. The next prime is 21212020222363. The reversal of 21212020222303 is 30322202021212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212020222303 is a prime.

It is a super-2 number, since 2×21212020222303² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212020222363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606010111151 + 10606010111152.

It is an arithmetic number, because the mean of its divisors is an integer number (10606010111152).

Almost surely, 2^{21212020222303} is an apocalyptic number.

21212020222303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212020222303 is an equidigital number, since it uses as much as digits as its factorization.

21212020222303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21212020222303 its reverse (30322202021212), we get a palindrome (51534222243515).

The spelling of 21212020222303 in words is "twenty-one trillion, two hundred twelve billion, twenty million, two hundred twenty-two thousand, three hundred three".