21121121210110 has 32 divisors (see below), whose sum is σ = 38459647340352. Its totient is φ = 8350534026240.

The previous prime is 21121121210069. The next prime is 21121121210129. The reversal of 21121121210110 is 1101212112112.

It is a super-2 number, since 2×21121121210110² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13334506 + ... + 14834125.

It is an arithmetic number, because the mean of its divisors is an integer number (1201863979386).

Almost surely, 2^{21121121210110} is an apocalyptic number.

21121121210110 is a deficient number, since it is larger than the sum of its proper divisors (17338526130242).

21121121210110 is a wasteful number, since it uses less digits than its factorization.

21121121210110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28169508.

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

Adding to 21121121210110 its reverse (1101212112112), we get a palindrome (22222333322222).

The spelling of 21121121210110 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred ten thousand, one hundred ten".