21627875429 has 2 divisors, whose sum is σ = 21627875430. Its totient is φ = 21627875428.

The previous prime is 21627875377. The next prime is 21627875447. The reversal of 21627875429 is 92457872612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20273488225 + 1354387204 = 142385^2 + 36802^2 .

It is a cyclic number.

It is not a de Polignac number, because 21627875429 - 2¹² = 21627871333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21627805429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10813937714 + 10813937715.

It is an arithmetic number, because the mean of its divisors is an integer number (10813937715).

Almost surely, 2^21627875429 is an apocalyptic number.

It is an amenable number.

21627875429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21627875429 is an equidigital number, since it uses as much as digits as its factorization.

21627875429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 53.

The spelling of 21627875429 in words is "twenty-one billion, six hundred twenty-seven million, eight hundred seventy-five thousand, four hundred twenty-nine".