21151322143 has 8 divisors (see below), whose sum is σ = 24394710560. Its totient is φ = 17963376480.

The previous prime is 21151322141. The next prime is 21151322161. The reversal of 21151322143 is 34122315112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21151322143 - 2¹ = 21151322141 is a prime.

It is a super-2 number, since 2×21151322143² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151322141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13859868 + ... + 13861393.

It is an arithmetic number, because the mean of its divisors is an integer number (3049338820).

Almost surely, 2^21151322143 is an apocalyptic number.

21151322143 is a deficient number, since it is larger than the sum of its proper divisors (3243388417).

21151322143 is a wasteful number, since it uses less digits than its factorization.

21151322143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27721377.

The product of its digits is 1440, while the sum is 25.

Adding to 21151322143 its reverse (34122315112), we get a palindrome (55273637255).

The spelling of 21151322143 in words is "twenty-one billion, one hundred fifty-one million, three hundred twenty-two thousand, one hundred forty-three".