21304523121 has 8 divisors (see below), whose sum is σ = 32464035264. Its totient is φ = 12174013200.

The previous prime is 21304523101. The next prime is 21304523137. The reversal of 21304523121 is 12132540312.

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

It is not a de Polignac number, because 21304523121 - 2¹⁴ = 21304506737 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21304523091 and 21304523100.

It is not an unprimeable number, because it can be changed into a prime (21304523101) 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, 507250530 + ... + 507250571.

It is an arithmetic number, because the mean of its divisors is an integer number (4058004408).

Almost surely, 2^21304523121 is an apocalyptic number.

21304523121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21304523121 is a deficient number, since it is larger than the sum of its proper divisors (11159512143).

21304523121 is a wasteful number, since it uses less digits than its factorization.

21304523121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014501111.

The product of its (nonzero) digits is 1440, while the sum is 24.

The spelling of 21304523121 in words is "twenty-one billion, three hundred four million, five hundred twenty-three thousand, one hundred twenty-one".