21353305143 has 16 divisors (see below), whose sum is σ = 29493434880. Its totient is φ = 13725709536.

The previous prime is 21353305123. The next prime is 21353305157. The reversal of 21353305143 is 34150335312.

It is not a de Polignac number, because 21353305143 - 2⁵ = 21353305111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21353305143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353305123) 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, 105555 + ... + 232052.

It is an arithmetic number, because the mean of its divisors is an integer number (1843339680).

Almost surely, 2^21353305143 is an apocalyptic number.

21353305143 is a deficient number, since it is larger than the sum of its proper divisors (8140129737).

21353305143 is a wasteful number, since it uses less digits than its factorization.

21353305143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338366.

The product of its (nonzero) digits is 16200, while the sum is 30.

The spelling of 21353305143 in words is "twenty-one billion, three hundred fifty-three million, three hundred five thousand, one hundred forty-three".