21002113302442 has 4 divisors (see below), whose sum is σ = 31503169953666. Its totient is φ = 10501056651220.

The previous prime is 21002113302409. The next prime is 21002113302451. The reversal of 21002113302442 is 24420331120012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15530448475161 + 5471664827281 = 3940869^2 + 2339159^2 .

It is a super-2 number, since 2×21002113302442² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250528325609 + ... + 5250528325612.

Almost surely, 2^{21002113302442} is an apocalyptic number.

21002113302442 is a deficient number, since it is larger than the sum of its proper divisors (10501056651224).

21002113302442 is a wasteful number, since it uses less digits than its factorization.

21002113302442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501056651223.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21002113302442 its reverse (24420331120012), we get a palindrome (45422444422454).

The spelling of 21002113302442 in words is "twenty-one trillion, two billion, one hundred thirteen million, three hundred two thousand, four hundred forty-two".