1221100102010 has 16 divisors (see below), whose sum is σ = 2207413579176. Its totient is φ = 486343730688.

The previous prime is 1221100102007. The next prime is 1221100102031. The reversal of 1221100102010 is 102010011221.

It can be written as a sum of positive squares in 4 ways, for example, as 643459061281 + 577641040729 = 802159^2 + 760027^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221100101982 and 1221100102000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262036319 + ... + 262040978.

Almost surely, 2^{1221100102010} is an apocalyptic number.

1221100102010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221100102010 is a deficient number, since it is larger than the sum of its proper divisors (986313477166).

1221100102010 is a wasteful number, since it uses less digits than its factorization.

1221100102010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524077537.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221100102010 its reverse (102010011221), we get a palindrome (1323110113231).

The spelling of 1221100102010 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred two thousand, ten".