21285410829 has 4 divisors (see below), whose sum is σ = 28380547776. Its totient is φ = 14190273884.

The previous prime is 21285410767. The next prime is 21285410837. The reversal of 21285410829 is 92801458212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21285410829 - 2⁷ = 21285410701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21285410429) 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 in 3 ways as a sum of consecutive naturals, for example, 3547568469 + ... + 3547568474.

It is an arithmetic number, because the mean of its divisors is an integer number (7095136944).

Almost surely, 2^21285410829 is an apocalyptic number.

It is an amenable number.

21285410829 is a deficient number, since it is larger than the sum of its proper divisors (7095136947).

21285410829 is an equidigital number, since it uses as much as digits as its factorization.

21285410829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7095136946.

The product of its (nonzero) digits is 92160, while the sum is 42.

The spelling of 21285410829 in words is "twenty-one billion, two hundred eighty-five million, four hundred ten thousand, eight hundred twenty-nine".