21053390122759 has 16 divisors (see below), whose sum is σ = 21534543940608. Its totient is φ = 20573632249632.

The previous prime is 21053390122741. The next prime is 21053390122789. The reversal of 21053390122759 is 95722109335012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21053390122759 - 2¹⁷ = 21053389991687 is a prime.

It is a super-2 number, since 2×21053390122759² (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 (21053390122789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165129574 + ... + 165257020.

It is an arithmetic number, because the mean of its divisors is an integer number (1345908996288).

Almost surely, 2^{21053390122759} is an apocalyptic number.

21053390122759 is a deficient number, since it is larger than the sum of its proper divisors (481153817849).

21053390122759 is a wasteful number, since it uses less digits than its factorization.

21053390122759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132894.

The product of its (nonzero) digits is 1020600, while the sum is 49.

The spelling of 21053390122759 in words is "twenty-one trillion, fifty-three billion, three hundred ninety million, one hundred twenty-two thousand, seven hundred fifty-nine".