21142202053830 has 128 divisors (see below), whose sum is σ = 60190898826240. Its totient is φ = 4685188815360.

The previous prime is 21142202053829. The next prime is 21142202053849. The reversal of 21142202053830 is 3835020224112.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 21142202053791 and 21142202053800.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 23481685 + ... + 24365424.

It is an arithmetic number, because the mean of its divisors is an integer number (470241397080).

Almost surely, 2^{21142202053830} is an apocalyptic number.

21142202053830 is an abundant number, since it is smaller than the sum of its proper divisors (39048696772410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21142202053830 is a wasteful number, since it uses less digits than its factorization.

21142202053830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47847246.

The product of its (nonzero) digits is 23040, while the sum is 33.

Adding to 21142202053830 its reverse (3835020224112), we get a palindrome (24977222277942).

The spelling of 21142202053830 in words is "twenty-one trillion, one hundred forty-two billion, two hundred two million, fifty-three thousand, eight hundred thirty".