21545314158 has 16 divisors (see below), whose sum is σ = 43101392976. Its totient is φ = 7179977280.

The previous prime is 21545314129. The next prime is 21545314181. The reversal of 21545314158 is 85141354512.

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, 422391 + ... + 470642.

It is an arithmetic number, because the mean of its divisors is an integer number (2693837061).

Almost surely, 2^21545314158 is an apocalyptic number.

21545314158 is an abundant number, since it is smaller than the sum of its proper divisors (21556078818).

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

21545314158 is a wasteful number, since it uses less digits than its factorization.

21545314158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897059.

The product of its digits is 96000, while the sum is 39.

The spelling of 21545314158 in words is "twenty-one billion, five hundred forty-five million, three hundred fourteen thousand, one hundred fifty-eight".