221540332129 has 2 divisors, whose sum is σ = 221540332130. Its totient is φ = 221540332128.

The previous prime is 221540332109. The next prime is 221540332147. The reversal of 221540332129 is 921233045122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115409678400 + 106130653729 = 339720^2 + 325777^2 .

It is a cyclic number.

It is not a de Polignac number, because 221540332129 - 2¹⁵ = 221540299361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221540332094 and 221540332103.

It is not a weakly prime, because it can be changed into another prime (221540332109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110770166064 + 110770166065.

It is an arithmetic number, because the mean of its divisors is an integer number (110770166065).

Almost surely, 2^221540332129 is an apocalyptic number.

It is an amenable number.

221540332129 is a deficient number, since it is larger than the sum of its proper divisors (1).

221540332129 is an equidigital number, since it uses as much as digits as its factorization.

221540332129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 221540332129 in words is "two hundred twenty-one billion, five hundred forty million, three hundred thirty-two thousand, one hundred twenty-nine".