121212121010 has 16 divisors (see below), whose sum is σ = 220342035672. Its totient is φ = 48004800000.

The previous prime is 121212121007. The next prime is 121212121153. The reversal of 121212121010 is 10121212121.

121212121010 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 4 ways, for example, as 105171138601 + 16040982409 = 324301^2 + 126653^2 .

It is an alternating number because its digits alternate between odd and even.

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, 60004991 + ... + 60007010.

Almost surely, 2^121212121010 is an apocalyptic number.

121212121010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121212121010 is a deficient number, since it is larger than the sum of its proper divisors (99129914662).

121212121010 is a wasteful number, since it uses less digits than its factorization.

121212121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120012109.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121212121010 its reverse (10121212121), we get a palindrome (131333333131).

The spelling of 121212121010 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, ten".