1221011031010 has 32 divisors (see below), whose sum is σ = 2202442870320. Its totient is φ = 487377345792.

The previous prime is 1221011030969. The next prime is 1221011031017. The reversal of 1221011031010 is 101301101221.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 239570112681 + 981440918329 = 489459^2 + 990677^2 .

It is not an unprimeable number, because it can be changed into a prime (1221011031017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53927412 + ... + 53950048.

Almost surely, 2^{1221011031010} is an apocalyptic number.

1221011031010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221011031010 is a deficient number, since it is larger than the sum of its proper divisors (981431839310).

1221011031010 is a wasteful number, since it uses less digits than its factorization.

1221011031010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33750.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1221011031010 its reverse (101301101221), we get a palindrome (1322312132231).

The spelling of 1221011031010 in words is "one trillion, two hundred twenty-one billion, eleven million, thirty-one thousand, ten".