21152230143 has 16 divisors (see below), whose sum is σ = 30785961600. Its totient is φ = 12811582880.

The previous prime is 21152230087. The next prime is 21152230181. The reversal of 21152230143 is 34103225112.

It is a cyclic number.

It is not a de Polignac number, because 21152230143 - 2⁶ = 21152230079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152230193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144528 + ... + 251381.

It is an arithmetic number, because the mean of its divisors is an integer number (1924122600).

Almost surely, 2^21152230143 is an apocalyptic number.

21152230143 is a deficient number, since it is larger than the sum of its proper divisors (9633731457).

21152230143 is a wasteful number, since it uses less digits than its factorization.

21152230143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397542.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21152230143 its reverse (34103225112), we get a palindrome (55255455255).

The spelling of 21152230143 in words is "twenty-one billion, one hundred fifty-two million, two hundred thirty thousand, one hundred forty-three".