21010413442 has 4 divisors (see below), whose sum is σ = 31515620166. Its totient is φ = 10505206720.

The previous prime is 21010413397. The next prime is 21010413467. The reversal of 21010413442 is 24431401012.

It is a happy number.

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., 20706922201 + 303491241 = 143899^2 + 17421^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252603359 + ... + 5252603362.

Almost surely, 2^21010413442 is an apocalyptic number.

21010413442 is a deficient number, since it is larger than the sum of its proper divisors (10505206724).

21010413442 is a wasteful number, since it uses less digits than its factorization.

21010413442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505206723.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21010413442 its reverse (24431401012), we get a palindrome (45441814454).

The spelling of 21010413442 in words is "twenty-one billion, ten million, four hundred thirteen thousand, four hundred forty-two".