21012132110 has 16 divisors (see below), whose sum is σ = 39812461200. Its totient is φ = 7962492096.

The previous prime is 21012132083. The next prime is 21012132137. The reversal of 21012132110 is 1123121012.

It is an interprime number because it is at equal distance from previous prime (21012132083) and next prime (21012132137).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55294895 + ... + 55295274.

It is an arithmetic number, because the mean of its divisors is an integer number (2488278825).

Almost surely, 2^21012132110 is an apocalyptic number.

21012132110 is a deficient number, since it is larger than the sum of its proper divisors (18800329090).

21012132110 is a wasteful number, since it uses less digits than its factorization.

21012132110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110590195.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21012132110 its reverse (1123121012), we get a palindrome (22135253122).

The spelling of 21012132110 in words is "twenty-one billion, twelve million, one hundred thirty-two thousand, one hundred ten".