21565150143 has 16 divisors (see below), whose sum is σ = 29748854880. Its totient is φ = 13879233536.

The previous prime is 21565150091. The next prime is 21565150163. The reversal of 21565150143 is 34105156512.

It is a cyclic number.

It is not a de Polignac number, because 21565150143 - 2⁹ = 21565149631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21565150163) 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, 1172071 + ... + 1190327.

It is an arithmetic number, because the mean of its divisors is an integer number (1859303430).

Almost surely, 2^21565150143 is an apocalyptic number.

21565150143 is a deficient number, since it is larger than the sum of its proper divisors (8183704737).

21565150143 is a wasteful number, since it uses less digits than its factorization.

21565150143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31866.

The product of its (nonzero) digits is 18000, while the sum is 33.

The spelling of 21565150143 in words is "twenty-one billion, five hundred sixty-five million, one hundred fifty thousand, one hundred forty-three".