21504663046 has 4 divisors (see below), whose sum is σ = 32256994572. Its totient is φ = 10752331522.

The previous prime is 21504663041. The next prime is 21504663091. The reversal of 21504663046 is 64036640512.

21504663046 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21504662996 and 21504663014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21504663041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5376165760 + ... + 5376165763.

It is an arithmetic number, because the mean of its divisors is an integer number (8064248643).

Almost surely, 2^21504663046 is an apocalyptic number.

21504663046 is a deficient number, since it is larger than the sum of its proper divisors (10752331526).

21504663046 is a wasteful number, since it uses less digits than its factorization.

21504663046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10752331525.

The product of its (nonzero) digits is 103680, while the sum is 37.

It can be divided in two parts, 2150466 and 3046, that added together give a palindrome (2153512).

The spelling of 21504663046 in words is "twenty-one billion, five hundred four million, six hundred sixty-three thousand, forty-six".