21540153534 has 16 divisors (see below), whose sum is σ = 43329328272. Its totient is φ = 7138547648.

The previous prime is 21540153511. The next prime is 21540153541. The reversal of 21540153534 is 43535104512.

It is a junction number, because it is equal to n+sod(n) for n = 21540153495 and 21540153504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10374759 + ... + 10376834.

It is an arithmetic number, because the mean of its divisors is an integer number (2708083017).

Almost surely, 2^21540153534 is an apocalyptic number.

21540153534 is an abundant number, since it is smaller than the sum of its proper divisors (21789174738).

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

21540153534 is a wasteful number, since it uses less digits than its factorization.

21540153534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20751771.

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 21540153534 in words is "twenty-one billion, five hundred forty million, one hundred fifty-three thousand, five hundred thirty-four".