1221124101 has 16 divisors (see below), whose sum is σ = 1654305408. Its totient is φ = 801057600.

The previous prime is 1221124097. The next prime is 1221124109. The reversal of 1221124101 is 1014211221.

It is not a de Polignac number, because 1221124101 - 2² = 1221124097 is a prime.

It is a super-2 number, since 2×1221124101² = 2982288140086116402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221124109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109935 + ... + 120531.

It is an arithmetic number, because the mean of its divisors is an integer number (103394088).

Almost surely, 2^1221124101 is an apocalyptic number.

It is an amenable number.

1221124101 is a deficient number, since it is larger than the sum of its proper divisors (433181307).

1221124101 is a wasteful number, since it uses less digits than its factorization.

1221124101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11212.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1221124101 is about 34944.5861472131. The cubic root of 1221124101 is about 1068.8578084605.

Adding to 1221124101 its reverse (1014211221), we get a palindrome (2235335322).

The spelling of 1221124101 in words is "one billion, two hundred twenty-one million, one hundred twenty-four thousand, one hundred one".