21145792243 has 2 divisors, whose sum is σ = 21145792244. Its totient is φ = 21145792242.

The previous prime is 21145792237. The next prime is 21145792277. The reversal of 21145792243 is 34229754112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21145792243 - 2⁹ = 21145791731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21145792196 and 21145792205.

It is not a weakly prime, because it can be changed into another prime (21145792643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572896121 + 10572896122.

It is an arithmetic number, because the mean of its divisors is an integer number (10572896122).

Almost surely, 2^21145792243 is an apocalyptic number.

21145792243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145792243 is an equidigital number, since it uses as much as digits as its factorization.

21145792243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The spelling of 21145792243 in words is "twenty-one billion, one hundred forty-five million, seven hundred ninety-two thousand, two hundred forty-three".