21213412042 has 8 divisors (see below), whose sum is σ = 31820837796. Its totient is φ = 10606466112.

The previous prime is 21213412027. The next prime is 21213412061. The reversal of 21213412042 is 24021431212.

It can be written as a sum of positive squares in 2 ways, for example, as 21201980881 + 11431161 = 145609^2 + 3381^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26178 + ... + 207634.

Almost surely, 2^21213412042 is an apocalyptic number.

21213412042 is a deficient number, since it is larger than the sum of its proper divisors (10607425754).

21213412042 is a wasteful number, since it uses less digits than its factorization.

21213412042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239912.

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

Adding to 21213412042 its reverse (24021431212), we get a palindrome (45234843254).

The spelling of 21213412042 in words is "twenty-one billion, two hundred thirteen million, four hundred twelve thousand, forty-two".