121221111010 has 8 divisors (see below), whose sum is σ = 218197999836. Its totient is φ = 48488444400.

The previous prime is 121221110993. The next prime is 121221111043. The reversal of 121221111010 is 10111122121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 111090889809 + 10130221201 = 333303^2 + 100649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6061055541 + ... + 6061055560.

Almost surely, 2^121221111010 is an apocalyptic number.

121221111010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221111010 is a deficient number, since it is larger than the sum of its proper divisors (96976888826).

121221111010 is a wasteful number, since it uses less digits than its factorization.

121221111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12122111108.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121221111010 its reverse (10111122121), we get a palindrome (131332233131).

It can be divided in two parts, 1212211 and 11010, that added together give a palindrome (1223221).

The spelling of 121221111010 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, ten".