21212020201223 has 2 divisors, whose sum is σ = 21212020201224. Its totient is φ = 21212020201222.

The previous prime is 21212020201193. The next prime is 21212020201237. The reversal of 21212020201223 is 32210202021212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212020201223 - 2³⁶ = 21143300724487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212020201195 and 21212020201204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212220201223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606010100611 + 10606010100612.

It is an arithmetic number, because the mean of its divisors is an integer number (10606010100612).

Almost surely, 2^{21212020201223} is an apocalyptic number.

21212020201223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212020201223 is an equidigital number, since it uses as much as digits as its factorization.

21212020201223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21212020201223 its reverse (32210202021212), we get a palindrome (53422222222435).

The spelling of 21212020201223 in words is "twenty-one trillion, two hundred twelve billion, twenty million, two hundred one thousand, two hundred twenty-three".