1261221110102 has 8 divisors (see below), whose sum is σ = 1891836897816. Its totient is φ = 630608810832.

The previous prime is 1261221110099. The next prime is 1261221110111. The reversal of 1261221110102 is 2010111221621.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406898 + ... + 1639514.

It is an arithmetic number, because the mean of its divisors is an integer number (236479612227).

Almost surely, 2^{1261221110102} is an apocalyptic number.

1261221110102 is a deficient number, since it is larger than the sum of its proper divisors (630615787714).

1261221110102 is a wasteful number, since it uses less digits than its factorization.

1261221110102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744222.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1261221110102 its reverse (2010111221621), we get a palindrome (3271332331723).

The spelling of 1261221110102 in words is "one trillion, two hundred sixty-one billion, two hundred twenty-one million, one hundred ten thousand, one hundred two".