212205501 has 10 divisors (see below), whose sum is σ = 316998462. Its totient is φ = 141470280.

The previous prime is 212205493. The next prime is 212205523. The reversal of 212205501 is 105502212.

It can be written as a sum of positive squares in only one way, i.e., 107122500 + 105083001 = 10350^2 + 10251^2 .

It is not a de Polignac number, because 212205501 - 2³ = 212205493 is a prime.

It is a super-2 number, since 2×212205501² = 90062349309322002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212205551) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1309830 + ... + 1309991.

Almost surely, 2^212205501 is an apocalyptic number.

It is an amenable number.

212205501 is a deficient number, since it is larger than the sum of its proper divisors (104792961).

212205501 is an equidigital number, since it uses as much as digits as its factorization.

212205501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619833 (or 2619824 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 212205501 is about 14567.2750025528. The cubic root of 212205501 is about 596.4657982375.

Adding to 212205501 its reverse (105502212), we get a palindrome (317707713).

The spelling of 212205501 in words is "two hundred twelve million, two hundred five thousand, five hundred one".