21142331343 has 32 divisors (see below), whose sum is σ = 35825600000. Its totient is φ = 12071524608.

The previous prime is 21142331311. The next prime is 21142331479. The reversal of 21142331343 is 34313324112.

It is a happy number.

It is not a de Polignac number, because 21142331343 - 2⁵ = 21142331311 is a prime.

It is a super-4 number, since 4×21142331343⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142336343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191280 + ... + 280842.

It is an arithmetic number, because the mean of its divisors is an integer number (1119550000).

Almost surely, 2^21142331343 is an apocalyptic number.

21142331343 is a deficient number, since it is larger than the sum of its proper divisors (14683268657).

21142331343 is a wasteful number, since it uses less digits than its factorization.

21142331343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90828 (or 90822 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 21142331343 its reverse (34313324112), we get a palindrome (55455655455).

The spelling of 21142331343 in words is "twenty-one billion, one hundred forty-two million, three hundred thirty-one thousand, three hundred forty-three".