214781228621 has 4 divisors (see below), whose sum is σ = 215025022044. Its totient is φ = 214537435200.

The previous prime is 214781228611. The next prime is 214781228729. The reversal of 214781228621 is 126822187412.

214781228621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70942322500 + 143838906121 = 266350^2 + 379261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-214781228621 is a prime.

It is a super-2 number, since 2×214781228621² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214781228611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121895390 + ... + 121897151.

It is an arithmetic number, because the mean of its divisors is an integer number (53756255511).

Almost surely, 2^214781228621 is an apocalyptic number.

It is an amenable number.

214781228621 is a deficient number, since it is larger than the sum of its proper divisors (243793423).

214781228621 is an equidigital number, since it uses as much as digits as its factorization.

214781228621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243793422.

The product of its digits is 172032, while the sum is 44.

The spelling of 214781228621 in words is "two hundred fourteen billion, seven hundred eighty-one million, two hundred twenty-eight thousand, six hundred twenty-one".