135331011421 has 2 divisors, whose sum is σ = 135331011422. Its totient is φ = 135331011420.

The previous prime is 135331011373. The next prime is 135331011449. The reversal of 135331011421 is 124110133531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81687356100 + 53643655321 = 285810^2 + 231611^2 .

It is a cyclic number.

It is not a de Polignac number, because 135331011421 - 2³¹ = 133183527773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135331021421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67665505710 + 67665505711.

It is an arithmetic number, because the mean of its divisors is an integer number (67665505711).

Almost surely, 2^135331011421 is an apocalyptic number.

It is an amenable number.

135331011421 is a deficient number, since it is larger than the sum of its proper divisors (1).

135331011421 is an equidigital number, since it uses as much as digits as its factorization.

135331011421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 135331011421 its reverse (124110133531), we get a palindrome (259441144952).

The spelling of 135331011421 in words is "one hundred thirty-five billion, three hundred thirty-one million, eleven thousand, four hundred twenty-one".