1221100012126 has 8 divisors (see below), whose sum is σ = 1939394136960. Its totient is φ = 574635299808.

The previous prime is 1221100012103. The next prime is 1221100012127. The reversal of 1221100012126 is 6212100011221.

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

It is a super-2 number, since 2×1221100012126² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100012127) 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, 17957353086 + ... + 17957353153.

It is an arithmetic number, because the mean of its divisors is an integer number (242424267120).

Almost surely, 2^{1221100012126} is an apocalyptic number.

1221100012126 is a deficient number, since it is larger than the sum of its proper divisors (718294124834).

1221100012126 is a wasteful number, since it uses less digits than its factorization.

1221100012126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35914706258.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1221100012126 its reverse (6212100011221), we get a palindrome (7433200023347).

The spelling of 1221100012126 in words is "one trillion, two hundred twenty-one billion, one hundred million, twelve thousand, one hundred twenty-six".