21545341039 has 2 divisors, whose sum is σ = 21545341040. Its totient is φ = 21545341038.

The previous prime is 21545341033. The next prime is 21545341067. The reversal of 21545341039 is 93014354512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21545341039 - 2⁵ = 21545341007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21545340989 and 21545341007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21545341033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10772670519 + 10772670520.

It is an arithmetic number, because the mean of its divisors is an integer number (10772670520).

Almost surely, 2^21545341039 is an apocalyptic number.

21545341039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21545341039 is an equidigital number, since it uses as much as digits as its factorization.

21545341039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 21545341039 in words is "twenty-one billion, five hundred forty-five million, three hundred forty-one thousand, thirty-nine".