21253162141 has 4 divisors (see below), whose sum is σ = 21279049884. Its totient is φ = 21227274400.

The previous prime is 21253162079. The next prime is 21253162163. The reversal of 21253162141 is 14126135212.

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 13398062500 + 7855099641 = 115750^2 + 88629^2 .

It is a cyclic number.

It is not a de Polignac number, because 21253162141 - 2⁷ = 21253162013 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 (21253162741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12942640 + ... + 12944281.

It is an arithmetic number, because the mean of its divisors is an integer number (5319762471).

Almost surely, 2^21253162141 is an apocalyptic number.

It is an amenable number.

21253162141 is a deficient number, since it is larger than the sum of its proper divisors (25887743).

21253162141 is an equidigital number, since it uses as much as digits as its factorization.

21253162141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25887742.

The product of its digits is 2880, while the sum is 28.

Adding to 21253162141 its reverse (14126135212), we get a palindrome (35379297353).

The spelling of 21253162141 in words is "twenty-one billion, two hundred fifty-three million, one hundred sixty-two thousand, one hundred forty-one".