21131022143 has 16 divisors (see below), whose sum is σ = 26842254336. Its totient is φ = 16155054240.

The previous prime is 21131022119. The next prime is 21131022149. The reversal of 21131022143 is 34122013112.

It is a cyclic number.

It is not a de Polignac number, because 21131022143 - 2⁶ = 21131022079 is a prime.

It is a super-4 number, since 4×21131022143⁴ (a number of 42 digits) contains 4444 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 (21131022149) 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, 2584871 + ... + 2593032.

It is an arithmetic number, because the mean of its divisors is an integer number (1677640896).

Almost surely, 2^21131022143 is an apocalyptic number.

21131022143 is a deficient number, since it is larger than the sum of its proper divisors (5711232193).

21131022143 is a wasteful number, since it uses less digits than its factorization.

21131022143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5177974.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21131022143 its reverse (34122013112), we get a palindrome (55253035255).

The spelling of 21131022143 in words is "twenty-one billion, one hundred thirty-one million, twenty-two thousand, one hundred forty-three".