21229349479 has 16 divisors (see below), whose sum is σ = 23102069760. Its totient is φ = 19391097600.

The previous prime is 21229349461. The next prime is 21229349483. The reversal of 21229349479 is 97494392212.

It is a cyclic number.

It is not a de Polignac number, because 21229349479 - 2⁵ = 21229349447 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 (21229349429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3012442 + ... + 3019480.

It is an arithmetic number, because the mean of its divisors is an integer number (1443879360).

Almost surely, 2^21229349479 is an apocalyptic number.

21229349479 is a deficient number, since it is larger than the sum of its proper divisors (1872720281).

21229349479 is a wasteful number, since it uses less digits than its factorization.

21229349479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9450.

The product of its digits is 1959552, while the sum is 52.

The spelling of 21229349479 in words is "twenty-one billion, two hundred twenty-nine million, three hundred forty-nine thousand, four hundred seventy-nine".