121021220110 has 32 divisors (see below), whose sum is σ = 251755231680. Its totient is φ = 41026774272.

The previous prime is 121021220101. The next prime is 121021220113. The reversal of 121021220110 is 11022120121.

It is a super-2 number, since 2×121021220110² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021220113) 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, 9706549 + ... + 9719008.

It is an arithmetic number, because the mean of its divisors is an integer number (7867350990).

Almost surely, 2^121021220110 is an apocalyptic number.

121021220110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121021220110 is an abundant number, since it is smaller than the sum of its proper divisors (130734011570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121021220110 is a wasteful number, since it uses less digits than its factorization.

121021220110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19425660.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121021220110 its reverse (11022120121), we get a palindrome (132043340231).

The spelling of 121021220110 in words is "one hundred twenty-one billion, twenty-one million, two hundred twenty thousand, one hundred ten".