21323455000 has 40 divisors (see below), whose sum is σ = 49960866780. Its totient is φ = 8529380000.

The previous prime is 21323454917. The next prime is 21323455007. The reversal of 21323455000 is 55432312.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323455007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2127346 + ... + 2137345.

Almost surely, 2^21323455000 is an apocalyptic number.

21323455000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323455000 is an abundant number, since it is smaller than the sum of its proper divisors (28637411780).

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

21323455000 is an equidigital number, since it uses as much as digits as its factorization.

21323455000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264717 (or 4264698 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 21323455000 its reverse (55432312), we get a palindrome (21378887312).

The spelling of 21323455000 in words is "twenty-one billion, three hundred twenty-three million, four hundred fifty-five thousand".