21534021542 has 8 divisors (see below), whose sum is σ = 35237489832. Its totient is φ = 9788191600.

The previous prime is 21534021503. The next prime is 21534021589. The reversal of 21534021542 is 24512043512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489409559 + ... + 489409602.

It is an arithmetic number, because the mean of its divisors is an integer number (4404686229).

Almost surely, 2^21534021542 is an apocalyptic number.

21534021542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21534021542 is a deficient number, since it is larger than the sum of its proper divisors (13703468290).

21534021542 is a wasteful number, since it uses less digits than its factorization.

21534021542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978819174.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 21534021542 in words is "twenty-one billion, five hundred thirty-four million, twenty-one thousand, five hundred forty-two".