21975375143 has 2 divisors, whose sum is σ = 21975375144. Its totient is φ = 21975375142.

The previous prime is 21975375133. The next prime is 21975375151. The reversal of 21975375143 is 34157357912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21975375143 - 2⁴ = 21975375127 is a prime.

It is a super-2 number, since 2×21975375143² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21975375113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10987687571 + 10987687572.

It is an arithmetic number, because the mean of its divisors is an integer number (10987687572).

Almost surely, 2^21975375143 is an apocalyptic number.

21975375143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21975375143 is an equidigital number, since it uses as much as digits as its factorization.

21975375143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 47.

The spelling of 21975375143 in words is "twenty-one billion, nine hundred seventy-five million, three hundred seventy-five thousand, one hundred forty-three".