21031043110 has 32 divisors (see below), whose sum is σ = 47196940032. Its totient is φ = 6555130080.

The previous prime is 21031043093. The next prime is 21031043129. The reversal of 21031043110 is 1134013012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13655752 + ... + 13657291.

It is an arithmetic number, because the mean of its divisors is an integer number (1474904376).

Almost surely, 2^21031043110 is an apocalyptic number.

21031043110 is an abundant number, since it is smaller than the sum of its proper divisors (26165896922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031043110 is a wasteful number, since it uses less digits than its factorization.

21031043110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27313068.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21031043110 its reverse (1134013012), we get a palindrome (22165056122).

The spelling of 21031043110 in words is "twenty-one billion, thirty-one million, forty-three thousand, one hundred ten".