21050042401253 has 16 divisors (see below), whose sum is σ = 23491158966720. Its totient is φ = 18745228935936.

The previous prime is 21050042401207. The next prime is 21050042401277. The reversal of 21050042401253 is 35210424005012.

It is a cyclic number.

It is not a de Polignac number, because 21050042401253 - 2¹⁸ = 21050042139109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050042491253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41150126 + ... + 41658527.

It is an arithmetic number, because the mean of its divisors is an integer number (1468197435420).

Almost surely, 2^{21050042401253} is an apocalyptic number.

It is an amenable number.

21050042401253 is a deficient number, since it is larger than the sum of its proper divisors (2441116565467).

21050042401253 is a wasteful number, since it uses less digits than its factorization.

21050042401253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82809476.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21050042401253 its reverse (35210424005012), we get a palindrome (56260466406265).

The spelling of 21050042401253 in words is "twenty-one trillion, fifty billion, forty-two million, four hundred one thousand, two hundred fifty-three".