221640352531451 has 16 divisors (see below), whose sum is σ = 259337950891008. Its totient is φ = 185456333160000.

The previous prime is 221640352531399. The next prime is 221640352531457. The reversal of 221640352531451 is 154135253046122.

It is a happy number.

It is not a de Polignac number, because 221640352531451 - 2¹⁴ = 221640352515067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221640352531457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203885075 + ... + 204969276.

It is an arithmetic number, because the mean of its divisors is an integer number (16208621930688).

Almost surely, 2^{221640352531451} is an apocalyptic number.

221640352531451 is a deficient number, since it is larger than the sum of its proper divisors (37697598359557).

221640352531451 is a wasteful number, since it uses less digits than its factorization.

221640352531451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408856202.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 221640352531451 in words is "two hundred twenty-one trillion, six hundred forty billion, three hundred fifty-two million, five hundred thirty-one thousand, four hundred fifty-one".