21420102043 has 8 divisors (see below), whose sum is σ = 21794799600. Its totient is φ = 21045792768.

The previous prime is 21420101971. The next prime is 21420102059. The reversal of 21420102043 is 34020102412.

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

It is a de Polignac number, because none of the positive numbers 2^k-21420102043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21420102043.

It is not an unprimeable number, because it can be changed into a prime (21420102083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15355 + ... + 207547.

It is an arithmetic number, because the mean of its divisors is an integer number (2724349950).

Almost surely, 2^21420102043 is an apocalyptic number.

21420102043 is a deficient number, since it is larger than the sum of its proper divisors (374697557).

21420102043 is a wasteful number, since it uses less digits than its factorization.

21420102043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194141.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21420102043 its reverse (34020102412), we get a palindrome (55440204455).

The spelling of 21420102043 in words is "twenty-one billion, four hundred twenty million, one hundred two thousand, forty-three".