21453254152 has 64 divisors (see below), whose sum is σ = 45143619840. Its totient is φ = 9474086400.

The previous prime is 21453254149. The next prime is 21453254171. The reversal of 21453254152 is 25145235412.

It is a happy number.

It is a super-2 number, since 2×21453254152² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 547702 + ... + 585562.

It is an arithmetic number, because the mean of its divisors is an integer number (705369060).

Almost surely, 2^21453254152 is an apocalyptic number.

21453254152 is a gapful number since it is divisible by the number (22) 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 21453254152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22571809920).

21453254152 is an abundant number, since it is smaller than the sum of its proper divisors (23690365688).

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

21453254152 is a wasteful number, since it uses less digits than its factorization.

21453254152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38062 (or 38058 counting only the distinct ones).

The product of its digits is 48000, while the sum is 34.

Adding to 21453254152 its reverse (25145235412), we get a palindrome (46598489564).

The spelling of 21453254152 in words is "twenty-one billion, four hundred fifty-three million, two hundred fifty-four thousand, one hundred fifty-two".