21334534452 has 144 divisors (see below), whose sum is σ = 68800123392. Its totient is φ = 5412536640.

The previous prime is 21334534451. The next prime is 21334534469. The reversal of 21334534452 is 25443543312.

21334534452 is a `hidden beast` number, since 2 + 133 + 45 + 34 + 452 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334534451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29703 + ... + 208689.

Almost surely, 2^21334534452 is an apocalyptic number.

21334534452 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 21334534452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34400061696).

21334534452 is an abundant number, since it is smaller than the sum of its proper divisors (47465588940).

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

21334534452 is a wasteful number, since it uses less digits than its factorization.

21334534452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179058 (or 179053 counting only the distinct ones).

The product of its digits is 172800, while the sum is 36.

The spelling of 21334534452 in words is "twenty-one billion, three hundred thirty-four million, five hundred thirty-four thousand, four hundred fifty-two".