20101221110 has 16 divisors (see below), whose sum is σ = 36183850416. Its totient is φ = 8040121248.

The previous prime is 20101221083. The next prime is 20101221143. The reversal of 20101221110 is 1112210102.

It is a super-3 number, since 3×20101221110³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20101221091 and 20101221100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332804 + ... + 388536.

It is an arithmetic number, because the mean of its divisors is an integer number (2261490651).

Almost surely, 2^20101221110 is an apocalyptic number.

20101221110 is a deficient number, since it is larger than the sum of its proper divisors (16082629306).

20101221110 is a wasteful number, since it uses less digits than its factorization.

20101221110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91807.

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

Adding to 20101221110 its reverse (1112210102), we get a palindrome (21213431212).

The spelling of 20101221110 in words is "twenty billion, one hundred one million, two hundred twenty-one thousand, one hundred ten".