21354666043 has 8 divisors (see below), whose sum is σ = 22284605088. Its totient is φ = 20424849984.

The previous prime is 21354666041. The next prime is 21354666071. The reversal of 21354666043 is 34066645312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21354666043 - 2¹ = 21354666041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21354665987 and 21354666005.

It is not an unprimeable number, because it can be changed into a prime (21354666041) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 597021 + ... + 631777.

It is an arithmetic number, because the mean of its divisors is an integer number (2785575636).

Almost surely, 2^21354666043 is an apocalyptic number.

21354666043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21354666043 is a deficient number, since it is larger than the sum of its proper divisors (929939045).

21354666043 is a wasteful number, since it uses less digits than its factorization.

21354666043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61493.

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 21354666043 in words is "twenty-one billion, three hundred fifty-four million, six hundred sixty-six thousand, forty-three".