21425214277 has 2 divisors, whose sum is σ = 21425214278. Its totient is φ = 21425214276.

The previous prime is 21425214263. The next prime is 21425214361. The reversal of 21425214277 is 77241252412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11263364641 + 10161849636 = 106129^2 + 100806^2 .

It is a cyclic number.

It is not a de Polignac number, because 21425214277 - 2⁷ = 21425214149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21425214227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712607138 + 10712607139.

It is an arithmetic number, because the mean of its divisors is an integer number (10712607139).

Almost surely, 2^21425214277 is an apocalyptic number.

It is an amenable number.

21425214277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425214277 is an equidigital number, since it uses as much as digits as its factorization.

21425214277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 37.

Adding to 21425214277 its reverse (77241252412), we get a palindrome (98666466689).

The spelling of 21425214277 in words is "twenty-one billion, four hundred twenty-five million, two hundred fourteen thousand, two hundred seventy-seven".