221185656007 has 4 divisors (see below), whose sum is σ = 221435020656. Its totient is φ = 220936291360.

The previous prime is 221185655981. The next prime is 221185656071. The reversal of 221185656007 is 700656581122.

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

It is a cyclic number.

It is not a de Polignac number, because 221185656007 - 2⁷ = 221185655879 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 (221185666007) 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, 124680994 + ... + 124682767.

It is an arithmetic number, because the mean of its divisors is an integer number (55358755164).

Almost surely, 2^221185656007 is an apocalyptic number.

221185656007 is a deficient number, since it is larger than the sum of its proper divisors (249364649).

221185656007 is an equidigital number, since it uses as much as digits as its factorization.

221185656007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249364648.

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 221185656007 in words is "two hundred twenty-one billion, one hundred eighty-five million, six hundred fifty-six thousand, seven".