21524829629 has 2 divisors, whose sum is σ = 21524829630. Its totient is φ = 21524829628.

The previous prime is 21524829607. The next prime is 21524829631. The reversal of 21524829629 is 92692842512.

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., 21054590404 + 470239225 = 145102^2 + 21685^2 .

It is a cyclic number.

It is not a de Polignac number, because 21524829629 - 2⁸ = 21524829373 is a prime.

Together with 21524829631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21524829679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10762414814 + 10762414815.

It is an arithmetic number, because the mean of its divisors is an integer number (10762414815).

Almost surely, 2^21524829629 is an apocalyptic number.

It is an amenable number.

21524829629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21524829629 is an equidigital number, since it uses as much as digits as its factorization.

21524829629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 50.

The spelling of 21524829629 in words is "twenty-one billion, five hundred twenty-four million, eight hundred twenty-nine thousand, six hundred twenty-nine".