221431044251 has 4 divisors (see below), whose sum is σ = 221553316104. Its totient is φ = 221308772400.

The previous prime is 221431044239. The next prime is 221431044293. The reversal of 221431044251 is 152440134122.

It is a happy number.

221431044251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221431044251 - 2³⁰ = 220357302427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221431044151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61133210 + ... + 61136831.

It is an arithmetic number, because the mean of its divisors is an integer number (55388329026).

Almost surely, 2^221431044251 is an apocalyptic number.

221431044251 is a deficient number, since it is larger than the sum of its proper divisors (122271853).

221431044251 is a wasteful number, since it uses less digits than its factorization.

221431044251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122271852.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 221431044251 its reverse (152440134122), we get a palindrome (373871178373).

The spelling of 221431044251 in words is "two hundred twenty-one billion, four hundred thirty-one million, forty-four thousand, two hundred fifty-one".