21121200110 has 32 divisors (see below), whose sum is σ = 38275951680. Its totient is φ = 8391333888.

The previous prime is 21121200101. The next prime is 21121200119. The reversal of 21121200110 is 1100212112.

It is an interprime number because it is at equal distance from previous prime (21121200101) and next prime (21121200119).

It is a super-2 number, since 2×21121200110² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121200091 and 21121200100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121200119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1251911 + ... + 1268669.

It is an arithmetic number, because the mean of its divisors is an integer number (1196123490).

Almost surely, 2^21121200110 is an apocalyptic number.

21121200110 is a deficient number, since it is larger than the sum of its proper divisors (17154751570).

21121200110 is a wasteful number, since it uses less digits than its factorization.

21121200110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17612.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21121200110 its reverse (1100212112), we get a palindrome (22221412222).

The spelling of 21121200110 in words is "twenty-one billion, one hundred twenty-one million, two hundred thousand, one hundred ten".