212721255 has 64 divisors (see below), whose sum is σ = 407462400. Its totient is φ = 104901120.

The previous prime is 212721247. The next prime is 212721259. The reversal of 212721255 is 552127212.

It is not a de Polignac number, because 212721255 - 2³ = 212721247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212721259) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 134620 + ... + 136190.

It is an arithmetic number, because the mean of its divisors is an integer number (6366600).

Almost surely, 2^212721255 is an apocalyptic number.

212721255 is a deficient number, since it is larger than the sum of its proper divisors (194741145).

212721255 is a wasteful number, since it uses less digits than its factorization.

212721255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661 (or 1655 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 212721255 is about 14584.9667466196. The cubic root of 212721255 is about 596.9486332411.

Adding to 212721255 its reverse (552127212), we get a palindrome (764848467).

The spelling of 212721255 in words is "two hundred twelve million, seven hundred twenty-one thousand, two hundred fifty-five".