221484742761 has 4 divisors (see below), whose sum is σ = 295312990352. Its totient is φ = 147656495172.

The previous prime is 221484742747. The next prime is 221484742837. The reversal of 221484742761 is 167247484122.

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 not a de Polignac number, because 221484742761 - 2⁶ = 221484742697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221484742761.

It is not an unprimeable number, because it can be changed into a prime (221484742261) 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, 36914123791 + ... + 36914123796.

It is an arithmetic number, because the mean of its divisors is an integer number (73828247588).

Almost surely, 2^221484742761 is an apocalyptic number.

It is an amenable number.

221484742761 is a deficient number, since it is larger than the sum of its proper divisors (73828247591).

221484742761 is an equidigital number, since it uses as much as digits as its factorization.

221484742761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73828247590.

The product of its digits is 1204224, while the sum is 48.

The spelling of 221484742761 in words is "two hundred twenty-one billion, four hundred eighty-four million, seven hundred forty-two thousand, seven hundred sixty-one".