21020311127 has 2 divisors, whose sum is σ = 21020311128. Its totient is φ = 21020311126.

The previous prime is 21020311121. The next prime is 21020311153. The reversal of 21020311127 is 72111302012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020311127 - 2⁴ = 21020311111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020311099 and 21020311108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020311121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510155563 + 10510155564.

It is an arithmetic number, because the mean of its divisors is an integer number (10510155564).

Almost surely, 2^21020311127 is an apocalyptic number.

21020311127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020311127 is an equidigital number, since it uses as much as digits as its factorization.

21020311127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 21020311127 its reverse (72111302012), we get a palindrome (93131613139).

The spelling of 21020311127 in words is "twenty-one billion, twenty million, three hundred eleven thousand, one hundred twenty-seven".