1221101220010 has 64 divisors (see below), whose sum is σ = 2662827374592. Its totient is φ = 393579104256.

The previous prime is 1221101219999. The next prime is 1221101220011. The reversal of 1221101220010 is 100221011221.

It is not an unprimeable number, because it can be changed into a prime (1221101220011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432454 + ... + 1621486.

It is an arithmetic number, because the mean of its divisors is an integer number (41606677728).

Almost surely, 2^{1221101220010} is an apocalyptic number.

1221101220010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221101220010 is an abundant number, since it is smaller than the sum of its proper divisors (1441726154582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221101220010 is a wasteful number, since it uses less digits than its factorization.

1221101220010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189927.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221101220010 its reverse (100221011221), we get a palindrome (1321322231231).

The spelling of 1221101220010 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred twenty thousand, ten".