1212121010 has 16 divisors (see below), whose sum is σ = 2183098176. Its totient is φ = 484563888.

The previous prime is 1212120991. The next prime is 1212121037. The reversal of 1212121010 is 101212121.

1212121010 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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

It is a junction number, because it is equal to n+sod(n) for n = 1212120982 and 1212121000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17222 + ... + 52161.

It is an arithmetic number, because the mean of its divisors is an integer number (136443636).

Almost surely, 2^1212121010 is an apocalyptic number.

1212121010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212121010 is a deficient number, since it is larger than the sum of its proper divisors (970977166).

1212121010 is a wasteful number, since it uses less digits than its factorization.

1212121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71137.

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

The square root of 1212121010 is about 34815.5282883945. The cubic root of 1212121010 is about 1066.2245049971.

Adding to 1212121010 its reverse (101212121), we get a palindrome (1313333131).

The spelling of 1212121010 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, ten".