21442023394242 has 64 divisors (see below), whose sum is σ = 47196253805184. Its totient is φ = 6440275735040.

The previous prime is 21442023394241. The next prime is 21442023394357. The reversal of 21442023394242 is 24249332024412.

It is a junction number, because it is equal to n+sod(n) for n = 21442023394194 and 21442023394203.

It is not an unprimeable number, because it can be changed into a prime (21442023394241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4088668 + ... + 7720184.

It is an arithmetic number, because the mean of its divisors is an integer number (737441465706).

Almost surely, 2^{21442023394242} is an apocalyptic number.

21442023394242 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 21442023394242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23598126902592).

21442023394242 is an abundant number, since it is smaller than the sum of its proper divisors (25754230410942).

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

21442023394242 is a wasteful number, since it uses less digits than its factorization.

21442023394242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3632323.

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 21442023394242 in words is "twenty-one trillion, four hundred forty-two billion, twenty-three million, three hundred ninety-four thousand, two hundred forty-two".