21214642352442 has 128 divisors (see below), whose sum is σ = 55261477490688. Its totient is φ = 5264733619200.

The previous prime is 21214642352401. The next prime is 21214642352467. The reversal of 21214642352442 is 24425324641212.

It is a super-2 number, since 2×21214642352442² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 21214642352394 and 21214642352403.

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, 8228428 + ... + 10494584.

It is an arithmetic number, because the mean of its divisors is an integer number (431730292896).

Almost surely, 2^{21214642352442} is an apocalyptic number.

21214642352442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21214642352442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27630738745344).

21214642352442 is an abundant number, since it is smaller than the sum of its proper divisors (34046835138246).

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

21214642352442 is a wasteful number, since it uses less digits than its factorization.

21214642352442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267084.

The product of its digits is 737280, while the sum is 42.

Adding to 21214642352442 its reverse (24425324641212), we get a palindrome (45639966993654).

The spelling of 21214642352442 in words is "twenty-one trillion, two hundred fourteen billion, six hundred forty-two million, three hundred fifty-two thousand, four hundred forty-two".