135447001021 has 2 divisors, whose sum is σ = 135447001022. Its totient is φ = 135447001020.

The previous prime is 135447000947. The next prime is 135447001037. The reversal of 135447001021 is 120100744531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100196938521 + 35250062500 = 316539^2 + 187750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135447001021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135447001121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67723500510 + 67723500511.

It is an arithmetic number, because the mean of its divisors is an integer number (67723500511).

Almost surely, 2^135447001021 is an apocalyptic number.

It is an amenable number.

135447001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

135447001021 is an equidigital number, since it uses as much as digits as its factorization.

135447001021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 135447001021 its reverse (120100744531), we get a palindrome (255547745552).

The spelling of 135447001021 in words is "one hundred thirty-five billion, four hundred forty-seven million, one thousand, twenty-one".