21485397229 has 8 divisors (see below), whose sum is σ = 21737596608. Its totient is φ = 21234580320.

The previous prime is 21485397139. The next prime is 21485397233. The reversal of 21485397229 is 92279358412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21485397229 - 2⁹ = 21485396717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21485317229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314337 + ... + 376534.

It is an arithmetic number, because the mean of its divisors is an integer number (2717199576).

Almost surely, 2^21485397229 is an apocalyptic number.

It is an amenable number.

21485397229 is a deficient number, since it is larger than the sum of its proper divisors (252199379).

21485397229 is a wasteful number, since it uses less digits than its factorization.

21485397229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691235.

The product of its digits is 2177280, while the sum is 52.

The spelling of 21485397229 in words is "twenty-one billion, four hundred eighty-five million, three hundred ninety-seven thousand, two hundred twenty-nine".