21410100442 has 4 divisors (see below), whose sum is σ = 32115150666. Its totient is φ = 10705050220.

The previous prime is 21410100403. The next prime is 21410100443. The reversal of 21410100442 is 24400101412.

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., 13938399721 + 7471700721 = 118061^2 + 86439^2 .

It is not an unprimeable number, because it can be changed into a prime (21410100443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5352525109 + ... + 5352525112.

Almost surely, 2^21410100442 is an apocalyptic number.

21410100442 is a deficient number, since it is larger than the sum of its proper divisors (10705050224).

21410100442 is a wasteful number, since it uses less digits than its factorization.

21410100442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10705050223.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21410100442 its reverse (24400101412), we get a palindrome (45810201854).

The spelling of 21410100442 in words is "twenty-one billion, four hundred ten million, one hundred thousand, four hundred forty-two".