20421435341 has 2 divisors, whose sum is σ = 20421435342. Its totient is φ = 20421435340.

The previous prime is 20421435319. The next prime is 20421435401. The reversal of 20421435341 is 14353412402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20394696100 + 26739241 = 142810^2 + 5171^2 .

It is a cyclic number.

It is not a de Polignac number, because 20421435341 - 2¹⁰ = 20421434317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20421435301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210717670 + 10210717671.

It is an arithmetic number, because the mean of its divisors is an integer number (10210717671).

Almost surely, 2^20421435341 is an apocalyptic number.

It is an amenable number.

20421435341 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421435341 is an equidigital number, since it uses as much as digits as its factorization.

20421435341 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 20421435341 its reverse (14353412402), we get a palindrome (34774847743).

The spelling of 20421435341 in words is "twenty billion, four hundred twenty-one million, four hundred thirty-five thousand, three hundred forty-one".