221185656049 has 4 divisors (see below), whose sum is σ = 223985474560. Its totient is φ = 218385837540.

The previous prime is 221185655981. The next prime is 221185656071. The reversal of 221185656049 is 940656581122.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 221185656049 - 2²⁵ = 221152101617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221185655993 and 221185656011.

It is not an unprimeable number, because it can be changed into a prime (221185656079) 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, 1399909137 + ... + 1399909294.

It is an arithmetic number, because the mean of its divisors is an integer number (55996368640).

Almost surely, 2^221185656049 is an apocalyptic number.

It is an amenable number.

221185656049 is a deficient number, since it is larger than the sum of its proper divisors (2799818511).

221185656049 is an equidigital number, since it uses as much as digits as its factorization.

221185656049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799818510.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 221185656049 in words is "two hundred twenty-one billion, one hundred eighty-five million, six hundred fifty-six thousand, forty-nine".