212028561 has 12 divisors (see below), whose sum is σ = 316143360. Its totient is φ = 136792440.

The previous prime is 212028529. The next prime is 212028643. The reversal of 212028561 is 165820212.

It is a happy number.

It is not a de Polignac number, because 212028561 - 2⁵ = 212028529 is a prime.

It is a super-2 number, since 2×212028561² = 89912221359461442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212028511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 379701 + ... + 380258.

It is an arithmetic number, because the mean of its divisors is an integer number (26345280).

Almost surely, 2^212028561 is an apocalyptic number.

It is an amenable number.

212028561 is a deficient number, since it is larger than the sum of its proper divisors (104114799).

212028561 is a wasteful number, since it uses less digits than its factorization.

212028561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759996 (or 759993 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 212028561 is about 14561.2005342966. The cubic root of 212028561 is about 596.2999715511.

Adding to 212028561 its reverse (165820212), we get a palindrome (377848773).

The spelling of 212028561 in words is "two hundred twelve million, twenty-eight thousand, five hundred sixty-one".