21251235143 has 2 divisors, whose sum is σ = 21251235144. Its totient is φ = 21251235142.

The previous prime is 21251235079. The next prime is 21251235149. The reversal of 21251235143 is 34153215212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21251235143 - 2⁶ = 21251235079 is a prime.

It is a super-2 number, since 2×21251235143² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21251235149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625617571 + 10625617572.

It is an arithmetic number, because the mean of its divisors is an integer number (10625617572).

Almost surely, 2^21251235143 is an apocalyptic number.

21251235143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21251235143 is an equidigital number, since it uses as much as digits as its factorization.

21251235143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The spelling of 21251235143 in words is "twenty-one billion, two hundred fifty-one million, two hundred thirty-five thousand, one hundred forty-three".