21024324321 has 32 divisors (see below), whose sum is σ = 37637956608. Its totient is φ = 10081592640.

The previous prime is 21024324301. The next prime is 21024324331. The reversal of 21024324321 is 12342342012.

It is a happy number.

It is not a de Polignac number, because 21024324321 - 2¹³ = 21024316129 is a prime.

It is a super-2 number, since 2×21024324321² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21024324291 and 21024324300.

It is not an unprimeable number, because it can be changed into a prime (21024324301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3497551 + ... + 3503556.

It is an arithmetic number, because the mean of its divisors is an integer number (1176186144).

Almost surely, 2^21024324321 is an apocalyptic number.

21024324321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21024324321 is a deficient number, since it is larger than the sum of its proper divisors (16613632287).

21024324321 is a wasteful number, since it uses less digits than its factorization.

21024324321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001141.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21024324321 its reverse (12342342012), we get a palindrome (33366666333).

The spelling of 21024324321 in words is "twenty-one billion, twenty-four million, three hundred twenty-four thousand, three hundred twenty-one".