21100402043 has 8 divisors (see below), whose sum is σ = 24129311712. Its totient is φ = 18075134016.

The previous prime is 21100402007. The next prime is 21100402049. The reversal of 21100402043 is 34020400112.

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 21100402043 - 2⁸ = 21100401787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100402049) 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, 897980 + ... + 921177.

It is an arithmetic number, because the mean of its divisors is an integer number (3016163964).

Almost surely, 2^21100402043 is an apocalyptic number.

21100402043 is a deficient number, since it is larger than the sum of its proper divisors (3028909669).

21100402043 is a wasteful number, since it uses less digits than its factorization.

21100402043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820821.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21100402043 its reverse (34020400112), we get a palindrome (55120802155).

The spelling of 21100402043 in words is "twenty-one billion, one hundred million, four hundred two thousand, forty-three".