221396377 has 4 divisors (see below), whose sum is σ = 222013440. Its totient is φ = 220779316.

The previous prime is 221396369. The next prime is 221396381. The reversal of 221396377 is 773693122.

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 an emirpimes, since its reverse is a distinct semiprime: 773693122 = 2 ⋅386846561.

It is a cyclic number.

It is not a de Polignac number, because 221396377 - 2³ = 221396369 is a prime.

It is a super-2 number, since 2×221396377² = 98032711497452258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221396347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307993 + ... + 308710.

It is an arithmetic number, because the mean of its divisors is an integer number (55503360).

Almost surely, 2^221396377 is an apocalyptic number.

It is an amenable number.

221396377 is a deficient number, since it is larger than the sum of its proper divisors (617063).

221396377 is an equidigital number, since it uses as much as digits as its factorization.

221396377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617062.

The product of its digits is 95256, while the sum is 40.

The square root of 221396377 is about 14879.3943761163. The cubic root of 221396377 is about 604.9556026888.

The spelling of 221396377 in words is "two hundred twenty-one million, three hundred ninety-six thousand, three hundred seventy-seven".