221535205122135 has 64 divisors (see below), whose sum is σ = 358505125608960. Its totient is φ = 116807481976320.

The previous prime is 221535205122109. The next prime is 221535205122137. The reversal of 221535205122135 is 531221502535122.

It is not a de Polignac number, because 221535205122135 - 2⁵ = 221535205122103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221535205122093 and 221535205122102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221535205122137) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2827793065 + ... + 2827871405.

It is an arithmetic number, because the mean of its divisors is an integer number (5601642587640).

Almost surely, 2^{221535205122135} is an apocalyptic number.

221535205122135 is a deficient number, since it is larger than the sum of its proper divisors (136969920486825).

221535205122135 is a wasteful number, since it uses less digits than its factorization.

221535205122135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82288.

The product of its (nonzero) digits is 180000, while the sum is 39.

Adding to 221535205122135 its reverse (531221502535122), we get a palindrome (752756707657257).

The spelling of 221535205122135 in words is "two hundred twenty-one trillion, five hundred thirty-five billion, two hundred five million, one hundred twenty-two thousand, one hundred thirty-five".