21121010110 has 8 divisors (see below), whose sum is σ = 38017818216. Its totient is φ = 8448404040.

The previous prime is 21121010063. The next prime is 21121010143. The reversal of 21121010110 is 1101012112.

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

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 2112101011 = 21121010110 / (2 + 1 + 1 + 2 + 1 + 0 + 1 + 0 + 1 + 1 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056050496 + ... + 1056050515.

It is an arithmetic number, because the mean of its divisors is an integer number (4752227277).

Almost surely, 2^21121010110 is an apocalyptic number.

21121010110 is a deficient number, since it is larger than the sum of its proper divisors (16896808106).

21121010110 is a wasteful number, since it uses less digits than its factorization.

21121010110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112101018.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21121010110 its reverse (1101012112), we get a palindrome (22222022222).

The spelling of 21121010110 in words is "twenty-one billion, one hundred twenty-one million, ten thousand, one hundred ten".