21403013042 has 4 divisors (see below), whose sum is σ = 32104519566. Its totient is φ = 10701506520.

The previous prime is 21403013017. The next prime is 21403013083. The reversal of 21403013042 is 24031030412.

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., 13618656601 + 7784356441 = 116699^2 + 88229^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5350753259 + ... + 5350753262.

Almost surely, 2^21403013042 is an apocalyptic number.

21403013042 is a deficient number, since it is larger than the sum of its proper divisors (10701506524).

21403013042 is a wasteful number, since it uses less digits than its factorization.

21403013042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10701506523.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21403013042 its reverse (24031030412), we get a palindrome (45434043454).

The spelling of 21403013042 in words is "twenty-one billion, four hundred three million, thirteen thousand, forty-two".