21211352253142 has 16 divisors (see below), whose sum is σ = 33690543304320. Its totient is φ = 9981242448768.

The previous prime is 21211352253121. The next prime is 21211352253149. The reversal of 21211352253142 is 24135225311212.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 21211352253098 and 21211352253107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211352253149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17220198 + ... + 18410809.

It is an arithmetic number, because the mean of its divisors is an integer number (2105658956520).

Almost surely, 2^{21211352253142} is an apocalyptic number.

21211352253142 is a deficient number, since it is larger than the sum of its proper divisors (12479191051178).

21211352253142 is a wasteful number, since it uses less digits than its factorization.

21211352253142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35648535.

The product of its digits is 28800, while the sum is 34.

Adding to 21211352253142 its reverse (24135225311212), we get a palindrome (45346577564354).

The spelling of 21211352253142 in words is "twenty-one trillion, two hundred eleven billion, three hundred fifty-two million, two hundred fifty-three thousand, one hundred forty-two".