21029629441 has 2 divisors, whose sum is σ = 21029629442. Its totient is φ = 21029629440.

The previous prime is 21029629429. The next prime is 21029629469. The reversal of 21029629441 is 14492692012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18961290000 + 2068339441 = 137700^2 + 45479^2 .

It is a cyclic number.

It is not a de Polignac number, because 21029629441 - 2⁹ = 21029628929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21029629394 and 21029629403.

It is not a weakly prime, because it can be changed into another prime (21029620441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10514814720 + 10514814721.

It is an arithmetic number, because the mean of its divisors is an integer number (10514814721).

Almost surely, 2^21029629441 is an apocalyptic number.

It is an amenable number.

21029629441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21029629441 is an equidigital number, since it uses as much as digits as its factorization.

21029629441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 21029629441 in words is "twenty-one billion, twenty-nine million, six hundred twenty-nine thousand, four hundred forty-one".