21486287783 has 2 divisors, whose sum is σ = 21486287784. Its totient is φ = 21486287782.

The previous prime is 21486287749. The next prime is 21486287789. The reversal of 21486287783 is 38778268412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21486287783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21486287789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10743143891 + 10743143892.

It is an arithmetic number, because the mean of its divisors is an integer number (10743143892).

Almost surely, 2^21486287783 is an apocalyptic number.

21486287783 is a deficient number, since it is larger than the sum of its proper divisors (1).

21486287783 is an equidigital number, since it uses as much as digits as its factorization.

21486287783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7225344, while the sum is 56.

The spelling of 21486287783 in words is "twenty-one billion, four hundred eighty-six million, two hundred eighty-seven thousand, seven hundred eighty-three".