21423402024 has 32 divisors (see below), whose sum is σ = 53756154240. Its totient is φ = 7114780800.

The previous prime is 21423402017. The next prime is 21423402059. The reversal of 21423402024 is 42020432412.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21423401985 and 21423402003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1640437 + ... + 1653444.

It is an arithmetic number, because the mean of its divisors is an integer number (1679879820).

Almost surely, 2^21423402024 is an apocalyptic number.

21423402024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21423402024 is an abundant number, since it is smaller than the sum of its proper divisors (32332752216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21423402024 is a wasteful number, since it uses less digits than its factorization.

21423402024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3294161 (or 3294157 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21423402024 its reverse (42020432412), we get a palindrome (63443834436).

The spelling of 21423402024 in words is "twenty-one billion, four hundred twenty-three million, four hundred two thousand, twenty-four".