212255521 has 2 divisors, whose sum is σ = 212255522. Its totient is φ = 212255520.

The previous prime is 212255473. The next prime is 212255573. The reversal of 212255521 is 125552212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210395025 + 1860496 = 14505^2 + 1364^2 .

It is a cyclic number.

It is not a de Polignac number, because 212255521 - 2¹⁷ = 212124449 is a prime.

It is not a weakly prime, because it can be changed into another prime (212255621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106127760 + 106127761.

It is an arithmetic number, because the mean of its divisors is an integer number (106127761).

Almost surely, 2^212255521 is an apocalyptic number.

It is an amenable number.

212255521 is a deficient number, since it is larger than the sum of its proper divisors (1).

212255521 is an equidigital number, since it uses as much as digits as its factorization.

212255521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000, while the sum is 25.

The square root of 212255521 is about 14568.9917633308. The cubic root of 212255521 is about 596.5126598491.

The spelling of 212255521 in words is "two hundred twelve million, two hundred fifty-five thousand, five hundred twenty-one".