427122221 has 4 divisors (see below), whose sum is σ = 427163712. Its totient is φ = 427080732.

The previous prime is 427122187. The next prime is 427122251. The reversal of 427122221 is 122221724.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427122221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427122251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7676 + ... + 30218.

It is an arithmetic number, because the mean of its divisors is an integer number (106790928).

Almost surely, 2^427122221 is an apocalyptic number.

It is an amenable number.

427122221 is a deficient number, since it is larger than the sum of its proper divisors (41491).

427122221 is a wasteful number, since it uses less digits than its factorization.

427122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41490.

The product of its digits is 896, while the sum is 23.

The square root of 427122221 is about 20666.9354525532. The cubic root of 427122221 is about 753.0966609539.

Adding to 427122221 its reverse (122221724), we get a palindrome (549343945).

The spelling of 427122221 in words is "four hundred twenty-seven million, one hundred twenty-two thousand, two hundred twenty-one".