21053390122789 has 2 divisors, whose sum is σ = 21053390122790. Its totient is φ = 21053390122788.

The previous prime is 21053390122741. The next prime is 21053390122867. The reversal of 21053390122789 is 98722109335012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12134458737025 + 8918931385764 = 3483455^2 + 2986458^2 .

It is a cyclic number.

It is not a de Polignac number, because 21053390122789 - 2¹³ = 21053390114597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21053390122189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526695061394 + 10526695061395.

It is an arithmetic number, because the mean of its divisors is an integer number (10526695061395).

Almost surely, 2^{21053390122789} is an apocalyptic number.

It is an amenable number.

21053390122789 is a deficient number, since it is larger than the sum of its proper divisors (1).

21053390122789 is an equidigital number, since it uses as much as digits as its factorization.

21053390122789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 21053390122789 in words is "twenty-one trillion, fifty-three billion, three hundred ninety million, one hundred twenty-two thousand, seven hundred eighty-nine".