1221012112010 has 16 divisors (see below), whose sum is σ = 2198051224416. Its totient is φ = 488353861968.

The previous prime is 1221012112009. The next prime is 1221012112031. The reversal of 1221012112010 is 102112101221.

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, 6272192 + ... + 6463931.

It is an arithmetic number, because the mean of its divisors is an integer number (137378201526).

Almost surely, 2^{1221012112010} is an apocalyptic number.

1221012112010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221012112010 is a deficient number, since it is larger than the sum of its proper divisors (977039112406).

1221012112010 is a wasteful number, since it uses less digits than its factorization.

1221012112010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12745717.

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

Adding to 1221012112010 its reverse (102112101221), we get a palindrome (1323124213231).

The spelling of 1221012112010 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred twelve thousand, ten".