21110043021 has 8 divisors (see below), whose sum is σ = 28147462560. Its totient is φ = 14072992752.

The previous prime is 21110042963. The next prime is 21110043037. The reversal of 21110043021 is 12034001112.

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

It is not a de Polignac number, because 21110043021 - 2⁶ = 21110042957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110043221) 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, 95890 + ... + 226748.

It is an arithmetic number, because the mean of its divisors is an integer number (3518432820).

Almost surely, 2^21110043021 is an apocalyptic number.

It is an amenable number.

21110043021 is a deficient number, since it is larger than the sum of its proper divisors (7037419539).

21110043021 is a wasteful number, since it uses less digits than its factorization.

21110043021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184635.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21110043021 its reverse (12034001112), we get a palindrome (33144044133).

The spelling of 21110043021 in words is "twenty-one billion, one hundred ten million, forty-three thousand, twenty-one".