221256677 has 2 divisors, whose sum is σ = 221256678. Its totient is φ = 221256676.

The previous prime is 221256617. The next prime is 221256731. The reversal of 221256677 is 776652122.

It is a happy number.

221256677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220492801 + 763876 = 14849^2 + 874^2 .

It is a cyclic number.

It is not a de Polignac number, because 221256677 - 2⁶ = 221256613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221256677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221256617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110628338 + 110628339.

It is an arithmetic number, because the mean of its divisors is an integer number (110628339).

Almost surely, 2^221256677 is an apocalyptic number.

It is an amenable number.

221256677 is a deficient number, since it is larger than the sum of its proper divisors (1).

221256677 is an equidigital number, since it uses as much as digits as its factorization.

221256677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 38.

The square root of 221256677 is about 14874.6992238499. The cubic root of 221256677 is about 604.8283346027.

The spelling of 221256677 in words is "two hundred twenty-one million, two hundred fifty-six thousand, six hundred seventy-seven".