1221101212010 has 32 divisors (see below), whose sum is σ = 2221712571600. Its totient is φ = 483175641600.

The previous prime is 1221101212007. The next prime is 1221101212039. The reversal of 1221101212010 is 102121011221.

It can be written as a sum of positive squares in 8 ways, for example, as 181005149809 + 1040096062201 = 425447^2 + 1019851^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 604856 + ... + 1675724.

Almost surely, 2^{1221101212010} is an apocalyptic number.

1221101212010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221101212010 is a deficient number, since it is larger than the sum of its proper divisors (1000611359590).

1221101212010 is a wasteful number, since it uses less digits than its factorization.

1221101212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072106.

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

Adding to 1221101212010 its reverse (102121011221), we get a palindrome (1323222223231).

The spelling of 1221101212010 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred twelve thousand, ten".