21024455442 has 8 divisors (see below), whose sum is σ = 42048910896. Its totient is φ = 7008151812.

The previous prime is 21024455399. The next prime is 21024455443. The reversal of 21024455442 is 24455442012.

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

21024455442 is an admirable number.

It is a super-4 number, since 4×21024455442⁴ (a number of 42 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21024455443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1752037948 + ... + 1752037959.

It is an arithmetic number, because the mean of its divisors is an integer number (5256113862).

Almost surely, 2^21024455442 is an apocalyptic number.

21024455442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21024455442 is a wasteful number, since it uses less digits than its factorization.

21024455442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3504075912.

The product of its (nonzero) digits is 51200, while the sum is 33.

Adding to 21024455442 its reverse (24455442012), we get a palindrome (45479897454).

It can be divided in two parts, 2102 and 4455442, that added together give a palindrome (4457544).

The spelling of 21024455442 in words is "twenty-one billion, twenty-four million, four hundred fifty-five thousand, four hundred forty-two".