21626134429 has 2 divisors, whose sum is σ = 21626134430. Its totient is φ = 21626134428.

The previous prime is 21626134303. The next prime is 21626134433. The reversal of 21626134429 is 92443162612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19683528804 + 1942605625 = 140298^2 + 44075^2 .

It is a cyclic number.

It is not a de Polignac number, because 21626134429 - 2²¹ = 21624037277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21626134391 and 21626134400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21626114429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10813067214 + 10813067215.

It is an arithmetic number, because the mean of its divisors is an integer number (10813067215).

Almost surely, 2^21626134429 is an apocalyptic number.

It is an amenable number.

21626134429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21626134429 is an equidigital number, since it uses as much as digits as its factorization.

21626134429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 40.

The spelling of 21626134429 in words is "twenty-one billion, six hundred twenty-six million, one hundred thirty-four thousand, four hundred twenty-nine".