1221111100010 has 8 divisors (see below), whose sum is σ = 2197999980036. Its totient is φ = 488444440000.

The previous prime is 1221111100003. The next prime is 1221111100093. The reversal of 1221111100010 is 100011111221.

It can be written as a sum of positive squares in 2 ways, for example, as 1207201020529 + 13910079481 = 1098727^2 + 117941^2 .

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

It is a super-2 number, since 2×1221111100010² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221111099964 and 1221111100000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61055554991 + ... + 61055555010.

Almost surely, 2^{1221111100010} is an apocalyptic number.

1221111100010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221111100010 is a deficient number, since it is larger than the sum of its proper divisors (976888880026).

1221111100010 is a wasteful number, since it uses less digits than its factorization.

1221111100010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122111110008.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1221111100010 its reverse (100011111221), we get a palindrome (1321122211231).

The spelling of 1221111100010 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred thousand, ten".