135221420242111 has 32 divisors (see below), whose sum is σ = 161503302647808. Its totient is φ = 110795760804960.

The previous prime is 135221420242081. The next prime is 135221420242141. The reversal of 135221420242111 is 111242024122531.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (135221420242081) and next prime (135221420242141).

It is not a de Polignac number, because 135221420242111 - 2⁵ = 135221420242079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135221420242141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 407876226 + ... + 408207616.

It is an arithmetic number, because the mean of its divisors is an integer number (5046978207744).

Almost surely, 2^{135221420242111} is an apocalyptic number.

135221420242111 is a deficient number, since it is larger than the sum of its proper divisors (26281882405697).

135221420242111 is a wasteful number, since it uses less digits than its factorization.

135221420242111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360331.

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 135221420242111 its reverse (111242024122531), we get a palindrome (246463444364642).

The spelling of 135221420242111 in words is "one hundred thirty-five trillion, two hundred twenty-one billion, four hundred twenty million, two hundred forty-two thousand, one hundred eleven".