21142432141 has 4 divisors (see below), whose sum is σ = 21150148284. Its totient is φ = 21134716000.

The previous prime is 21142432127. The next prime is 21142432151. The reversal of 21142432141 is 14123424112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15768076041 + 5374356100 = 125571^2 + 73310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21142432141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142432151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3853960 + ... + 3859441.

It is an arithmetic number, because the mean of its divisors is an integer number (5287537071).

Almost surely, 2^21142432141 is an apocalyptic number.

It is an amenable number.

21142432141 is a deficient number, since it is larger than the sum of its proper divisors (7716143).

21142432141 is an equidigital number, since it uses as much as digits as its factorization.

21142432141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7716142.

The product of its digits is 1536, while the sum is 25.

Adding to 21142432141 its reverse (14123424112), we get a palindrome (35265856253).

The spelling of 21142432141 in words is "twenty-one billion, one hundred forty-two million, four hundred thirty-two thousand, one hundred forty-one".