21525143534 has 4 divisors (see below), whose sum is σ = 32287715304. Its totient is φ = 10762571766.

The previous prime is 21525143449. The next prime is 21525143543. The reversal of 21525143534 is 43534152512.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21525143494 and 21525143503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5381285882 + ... + 5381285885.

It is an arithmetic number, because the mean of its divisors is an integer number (8071928826).

Almost surely, 2^21525143534 is an apocalyptic number.

21525143534 is a deficient number, since it is larger than the sum of its proper divisors (10762571770).

21525143534 is a wasteful number, since it uses less digits than its factorization.

21525143534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10762571769.

The product of its digits is 72000, while the sum is 35.

The spelling of 21525143534 in words is "twenty-one billion, five hundred twenty-five million, one hundred forty-three thousand, five hundred thirty-four".