21530451134552 has 8 divisors (see below), whose sum is σ = 40369595877300. Its totient is φ = 10765225567272.

The previous prime is 21530451134527. The next prime is 21530451134557. The reversal of 21530451134552 is 25543115403512.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530451134557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345653195902 + ... + 1345653195917.

Almost surely, 2^{21530451134552} is an apocalyptic number.

It is an amenable number.

21530451134552 is a deficient number, since it is larger than the sum of its proper divisors (18839144742748).

21530451134552 is a wasteful number, since it uses less digits than its factorization.

21530451134552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2691306391825 (or 2691306391821 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 21530451134552 in words is "twenty-one trillion, five hundred thirty billion, four hundred fifty-one million, one hundred thirty-four thousand, five hundred fifty-two".