21020244143611 has 2 divisors, whose sum is σ = 21020244143612. Its totient is φ = 21020244143610.

The previous prime is 21020244143473. The next prime is 21020244143617. The reversal of 21020244143611 is 11634144202012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020244143611 - 2¹³ = 21020244135419 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020244143617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510122071805 + 10510122071806.

It is an arithmetic number, because the mean of its divisors is an integer number (10510122071806).

Almost surely, 2^{21020244143611} is an apocalyptic number.

21020244143611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020244143611 is an equidigital number, since it uses as much as digits as its factorization.

21020244143611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 21020244143611 its reverse (11634144202012), we get a palindrome (32654388345623).

The spelling of 21020244143611 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty-three thousand, six hundred eleven".