21427671121 has 2 divisors, whose sum is σ = 21427671122. Its totient is φ = 21427671120.

The previous prime is 21427671103. The next prime is 21427671127. The reversal of 21427671121 is 12117672412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17962700625 + 3464970496 = 134025^2 + 58864^2 .

It is a cyclic number.

It is not a de Polignac number, because 21427671121 - 2¹³ = 21427662929 is a prime.

It is not a weakly prime, because it can be changed into another prime (21427671127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10713835560 + 10713835561.

It is an arithmetic number, because the mean of its divisors is an integer number (10713835561).

Almost surely, 2^21427671121 is an apocalyptic number.

It is an amenable number.

21427671121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21427671121 is an equidigital number, since it uses as much as digits as its factorization.

21427671121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 34.

The spelling of 21427671121 in words is "twenty-one billion, four hundred twenty-seven million, six hundred seventy-one thousand, one hundred twenty-one".