21255446039 has 2 divisors, whose sum is σ = 21255446040. Its totient is φ = 21255446038.

The previous prime is 21255446011. The next prime is 21255446063. The reversal of 21255446039 is 93064455212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21255446039 - 2¹² = 21255441943 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21255445987 and 21255446005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21255446089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627723019 + 10627723020.

It is an arithmetic number, because the mean of its divisors is an integer number (10627723020).

Almost surely, 2^21255446039 is an apocalyptic number.

21255446039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21255446039 is an equidigital number, since it uses as much as digits as its factorization.

21255446039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 21255446039 in words is "twenty-one billion, two hundred fifty-five million, four hundred forty-six thousand, thirty-nine".