21783484907 has 2 divisors, whose sum is σ = 21783484908.
Its totient is φ = 21783484906.
The previous prime is 21783484903. The next prime is 21783484913. The reversal of 21783484907 is 70948438712.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 21783484907 - 22 = 21783484903 is a prime.
It is not a weakly prime, because it can be changed into another prime (21783484903) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10891742453 + 10891742454.
It is an arithmetic number, because the mean of its divisors is an integer number (10891742454).
Almost surely, 221783484907 is an apocalyptic number.
21783484907 is a deficient number, since it is larger than the sum of its proper divisors (1).
21783484907 is an equidigital number, since it uses as much as digits as its factorization.
21783484907 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 2709504, while the sum is 53.
The spelling of 21783484907 in words is "twenty-one billion, seven hundred eighty-three million, four hundred eighty-four thousand, nine hundred seven".