21478394229 has 8 divisors (see below), whose sum is σ = 28638751680. Its totient is φ = 14318483136.

The previous prime is 21478394159. The next prime is 21478394261. The reversal of 21478394229 is 92249387412.

It is a happy number.

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

It is not a de Polignac number, because 21478394229 - 2¹⁵ = 21478361461 is a prime.

It is a super-2 number, since 2×21478394229² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21478394929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24349 + ... + 208685.

It is an arithmetic number, because the mean of its divisors is an integer number (3579843960).

Almost surely, 2^21478394229 is an apocalyptic number.

It is an amenable number.

21478394229 is a deficient number, since it is larger than the sum of its proper divisors (7160357451).

21478394229 is a wasteful number, since it uses less digits than its factorization.

21478394229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223179.

The product of its digits is 1741824, while the sum is 51.

The spelling of 21478394229 in words is "twenty-one billion, four hundred seventy-eight million, three hundred ninety-four thousand, two hundred twenty-nine".