21014424391 has 2 divisors, whose sum is σ = 21014424392. Its totient is φ = 21014424390.

The previous prime is 21014424337. The next prime is 21014424413. The reversal of 21014424391 is 19342441012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21014424391 - 2²⁹ = 20477553479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21014484391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507212195 + 10507212196.

It is an arithmetic number, because the mean of its divisors is an integer number (10507212196).

Almost surely, 2^21014424391 is an apocalyptic number.

21014424391 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014424391 is an equidigital number, since it uses as much as digits as its factorization.

21014424391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 21014424391 in words is "twenty-one billion, fourteen million, four hundred twenty-four thousand, three hundred ninety-one".