21103021043 has 12 divisors (see below), whose sum is σ = 24195391848. Its totient is φ = 18333843840.

The previous prime is 21103021007. The next prime is 21103021063. The reversal of 21103021043 is 34012030112.

It is not a de Polignac number, because 21103021043 - 2⁶ = 21103020979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (21103021063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3669773 + ... + 3675518.

It is an arithmetic number, because the mean of its divisors is an integer number (2016282654).

Almost surely, 2^21103021043 is an apocalyptic number.

21103021043 is a deficient number, since it is larger than the sum of its proper divisors (3092370805).

21103021043 is a wasteful number, since it uses less digits than its factorization.

21103021043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7345334 (or 7345321 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21103021043 its reverse (34012030112), we get a palindrome (55115051155).

The spelling of 21103021043 in words is "twenty-one billion, one hundred three million, twenty-one thousand, forty-three".