21020323143 has 8 divisors (see below), whose sum is σ = 29502208000. Its totient is φ = 13275993528.

The previous prime is 21020323123. The next prime is 21020323153. The reversal of 21020323143 is 34132302012.

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

It is not a de Polignac number, because 21020323143 - 2¹⁷ = 21020192071 is a prime.

It is a super-2 number, since 2×21020323143² (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 (21020323123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184388743 + ... + 184388856.

It is an arithmetic number, because the mean of its divisors is an integer number (3687776000).

Almost surely, 2^21020323143 is an apocalyptic number.

21020323143 is a deficient number, since it is larger than the sum of its proper divisors (8481884857).

21020323143 is a wasteful number, since it uses less digits than its factorization.

21020323143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368777621.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21020323143 its reverse (34132302012), we get a palindrome (55152625155).

The spelling of 21020323143 in words is "twenty-one billion, twenty million, three hundred twenty-three thousand, one hundred forty-three".