21120012019783 has 2 divisors, whose sum is σ = 21120012019784. Its totient is φ = 21120012019782.

The previous prime is 21120012019697. The next prime is 21120012019807. The reversal of 21120012019783 is 38791021002112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21120012019783 - 2¹⁷ = 21120011888711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120012011783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560006009891 + 10560006009892.

It is an arithmetic number, because the mean of its divisors is an integer number (10560006009892).

Almost surely, 2^{21120012019783} is an apocalyptic number.

21120012019783 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120012019783 is an equidigital number, since it uses as much as digits as its factorization.

21120012019783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The spelling of 21120012019783 in words is "twenty-one trillion, one hundred twenty billion, twelve million, nineteen thousand, seven hundred eighty-three".