212554221 has 24 divisors (see below), whose sum is σ = 315250656. Its totient is φ = 126335040.

The previous prime is 212554211. The next prime is 212554241. The reversal of 212554221 is 122455212.

It is not a de Polignac number, because 212554221 - 2¹³ = 212546029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212554191 and 212554200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212554211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91551 + ... + 93843.

It is an arithmetic number, because the mean of its divisors is an integer number (13135444).

Almost surely, 2^212554221 is an apocalyptic number.

It is an amenable number.

212554221 is a deficient number, since it is larger than the sum of its proper divisors (102696435).

212554221 is a wasteful number, since it uses less digits than its factorization.

212554221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413 (or 2360 counting only the distinct ones).

The product of its digits is 1600, while the sum is 24.

The square root of 212554221 is about 14579.2393834521. The cubic root of 212554221 is about 596.7923460413.

Subtracting from 212554221 its reverse (122455212), we obtain a palindrome (90099009).

The spelling of 212554221 in words is "two hundred twelve million, five hundred fifty-four thousand, two hundred twenty-one".