21541636142 has 32 divisors (see below), whose sum is σ = 35180308800. Its totient is φ = 9833644800.

The previous prime is 21541636141. The next prime is 21541636163. The reversal of 21541636142 is 24163614512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541636141) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 902984 + ... + 926532.

It is an arithmetic number, because the mean of its divisors is an integer number (1099384650).

Almost surely, 2^21541636142 is an apocalyptic number.

21541636142 is a deficient number, since it is larger than the sum of its proper divisors (13638672658).

21541636142 is a wasteful number, since it uses less digits than its factorization.

21541636142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23948.

The product of its digits is 34560, while the sum is 35.

The spelling of 21541636142 in words is "twenty-one billion, five hundred forty-one million, six hundred thirty-six thousand, one hundred forty-two".