21907203612839 has 2 divisors, whose sum is σ = 21907203612840. Its totient is φ = 21907203612838.

The previous prime is 21907203612821. The next prime is 21907203612863. The reversal of 21907203612839 is 93821630270912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21907203612839 - 2¹² = 21907203608743 is a prime.

It is a super-2 number, since 2×21907203612839² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21907203615839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10953601806419 + 10953601806420.

It is an arithmetic number, because the mean of its divisors is an integer number (10953601806420).

Almost surely, 2^{21907203612839} is an apocalyptic number.

21907203612839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21907203612839 is an equidigital number, since it uses as much as digits as its factorization.

21907203612839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The spelling of 21907203612839 in words is "twenty-one trillion, nine hundred seven billion, two hundred three million, six hundred twelve thousand, eight hundred thirty-nine".