21054652243 has 2 divisors, whose sum is σ = 21054652244. Its totient is φ = 21054652242.

The previous prime is 21054652207. The next prime is 21054652291. The reversal of 21054652243 is 34225645012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21054652243 - 2¹⁷ = 21054521171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21054652199 and 21054652208.

It is not a weakly prime, because it can be changed into another prime (21054652543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527326121 + 10527326122.

It is an arithmetic number, because the mean of its divisors is an integer number (10527326122).

Almost surely, 2^21054652243 is an apocalyptic number.

21054652243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054652243 is an equidigital number, since it uses as much as digits as its factorization.

21054652243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 34.

The spelling of 21054652243 in words is "twenty-one billion, fifty-four million, six hundred fifty-two thousand, two hundred forty-three".