1221120101 has 8 divisors (see below), whose sum is σ = 1326854400. Its totient is φ = 1119532320.

The previous prime is 1221120079. The next prime is 1221120107. The reversal of 1221120101 is 1010211221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221120101 is a prime.

It is a super-2 number, since 2×1221120101² = 2982268602132500402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221120107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1036016 + ... + 1037193.

It is an arithmetic number, because the mean of its divisors is an integer number (165856800).

Almost surely, 2^1221120101 is an apocalyptic number.

It is an amenable number.

1221120101 is a deficient number, since it is larger than the sum of its proper divisors (105734299).

1221120101 is a wasteful number, since it uses less digits than its factorization.

1221120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073259.

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

The square root of 1221120101 is about 34944.5289136941. The cubic root of 1221120101 is about 1068.8566413839.

Adding to 1221120101 its reverse (1010211221), we get a palindrome (2231331322).

It can be divided in two parts, 1221120 and 101, that added together give a palindrome (1221221).

The spelling of 1221120101 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred one".