21420014242 has 8 divisors (see below), whose sum is σ = 35050932432. Its totient is φ = 9736370100.

The previous prime is 21420014227. The next prime is 21420014299. The reversal of 21420014242 is 24241002412.

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

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 973637011 = 21420014242 / (2 + 1 + 4 + 2 + 0 + 0 + 1 + 4 + 2 + 4 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486818484 + ... + 486818527.

It is an arithmetic number, because the mean of its divisors is an integer number (4381366554).

Almost surely, 2^21420014242 is an apocalyptic number.

21420014242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21420014242 is a deficient number, since it is larger than the sum of its proper divisors (13630918190).

21420014242 is a wasteful number, since it uses less digits than its factorization.

21420014242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973637024.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21420014242 its reverse (24241002412), we get a palindrome (45661016654).

The spelling of 21420014242 in words is "twenty-one billion, four hundred twenty million, fourteen thousand, two hundred forty-two".