21392770783 has 2 divisors, whose sum is σ = 21392770784. Its totient is φ = 21392770782.

The previous prime is 21392770781. The next prime is 21392770799. The reversal of 21392770783 is 38707729312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21392770783 - 2¹ = 21392770781 is a prime.

Together with 21392770781, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21392770781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10696385391 + 10696385392.

It is an arithmetic number, because the mean of its divisors is an integer number (10696385392).

Almost surely, 2^21392770783 is an apocalyptic number.

21392770783 is a deficient number, since it is larger than the sum of its proper divisors (1).

21392770783 is an equidigital number, since it uses as much as digits as its factorization.

21392770783 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 889056, while the sum is 49.

The spelling of 21392770783 in words is "twenty-one billion, three hundred ninety-two million, seven hundred seventy thousand, seven hundred eighty-three".