21478649223 has 8 divisors (see below), whose sum is σ = 28640468736. Its totient is φ = 14317964600.

The previous prime is 21478649219. The next prime is 21478649267. The reversal of 21478649223 is 32294687412.

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 21478649223 - 2² = 21478649219 is a prime.

It is a super-2 number, since 2×21478649223² (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 (21478649273) 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, 238533 + ... + 315998.

It is an arithmetic number, because the mean of its divisors is an integer number (3580058592).

Almost surely, 2^21478649223 is an apocalyptic number.

21478649223 is a deficient number, since it is larger than the sum of its proper divisors (7161819513).

21478649223 is a wasteful number, since it uses less digits than its factorization.

21478649223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567445.

The product of its digits is 1161216, while the sum is 48.

The spelling of 21478649223 in words is "twenty-one billion, four hundred seventy-eight million, six hundred forty-nine thousand, two hundred twenty-three".