21121320110 has 32 divisors (see below), whose sum is σ = 41485092192. Its totient is φ = 7678535680.

The previous prime is 21121320097. The next prime is 21121320139. The reversal of 21121320110 is 1102312112.

It is a super-2 number, since 2×21121320110² (a number of 21 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, 454934 + ... + 499206.

It is an arithmetic number, because the mean of its divisors is an integer number (1296409131).

Almost surely, 2^21121320110 is an apocalyptic number.

21121320110 is a deficient number, since it is larger than the sum of its proper divisors (20363772082).

21121320110 is a wasteful number, since it uses less digits than its factorization.

21121320110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48628.

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

Adding to 21121320110 its reverse (1102312112), we get a palindrome (22223632222).

The spelling of 21121320110 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty thousand, one hundred ten".