21420243231334 has 4 divisors (see below), whose sum is σ = 32130364847004. Its totient is φ = 10710121615666.

The previous prime is 21420243231329. The next prime is 21420243231337. The reversal of 21420243231334 is 43313234202412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21420243231334.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420243231337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5355060807832 + ... + 5355060807835.

It is an arithmetic number, because the mean of its divisors is an integer number (8032591211751).

Almost surely, 2^{21420243231334} is an apocalyptic number.

21420243231334 is a deficient number, since it is larger than the sum of its proper divisors (10710121615670).

21420243231334 is a wasteful number, since it uses less digits than its factorization.

21420243231334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10710121615669.

The product of its (nonzero) digits is 82944, while the sum is 34.

Adding to 21420243231334 its reverse (43313234202412), we get a palindrome (64733477433746).

The spelling of 21420243231334 in words is "twenty-one trillion, four hundred twenty billion, two hundred forty-three million, two hundred thirty-one thousand, three hundred thirty-four".