1221220011010 has 8 divisors (see below), whose sum is σ = 2198196019836. Its totient is φ = 488488004400.

The previous prime is 1221220010971. The next prime is 1221220011013. The reversal of 1221220011010 is 101100221221.

It can be written as a sum of positive squares in 2 ways, for example, as 979365557641 + 241854453369 = 989629^2 + 491787^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1221220011013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61061000541 + ... + 61061000560.

Almost surely, 2^{1221220011010} is an apocalyptic number.

1221220011010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221220011010 is a deficient number, since it is larger than the sum of its proper divisors (976976008826).

1221220011010 is a wasteful number, since it uses less digits than its factorization.

1221220011010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122122001108.

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

Adding to 1221220011010 its reverse (101100221221), we get a palindrome (1322320232231).

The spelling of 1221220011010 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, eleven thousand, ten".