21053390122757 has 4 divisors (see below), whose sum is σ = 21057123660960. Its totient is φ = 21049656584556.

The previous prime is 21053390122741. The next prime is 21053390122789. The reversal of 21053390122757 is 75722109335012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21053390122757 - 2⁴ = 21053390122741 is a prime.

It is a super-2 number, since 2×21053390122757² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21053390122057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1866760643 + ... + 1866771920.

It is an arithmetic number, because the mean of its divisors is an integer number (5264280915240).

Almost surely, 2^{21053390122757} is an apocalyptic number.

It is an amenable number.

21053390122757 is a deficient number, since it is larger than the sum of its proper divisors (3733538203).

21053390122757 is an equidigital number, since it uses as much as digits as its factorization.

21053390122757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3733538202.

The product of its (nonzero) digits is 793800, while the sum is 47.

Adding to 21053390122757 its reverse (75722109335012), we get a palindrome (96775499457769).

The spelling of 21053390122757 in words is "twenty-one trillion, fifty-three billion, three hundred ninety million, one hundred twenty-two thousand, seven hundred fifty-seven".