21453263000 has 128 divisors (see below), whose sum is σ = 54188447040. Its totient is φ = 7902720000.

The previous prime is 21453262973. The next prime is 21453263053. The reversal of 21453263000 is 36235412.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 6381320 + ... + 6384680.

Almost surely, 2^21453263000 is an apocalyptic number.

21453263000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21453263000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27094223520).

21453263000 is an abundant number, since it is smaller than the sum of its proper divisors (32735184040).

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

21453263000 is a wasteful number, since it uses less digits than its factorization.

21453263000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886 (or 3872 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21453263000 its reverse (36235412), we get a palindrome (21489498412).

The spelling of 21453263000 in words is "twenty-one billion, four hundred fifty-three million, two hundred sixty-three thousand".