1222121101 has 4 divisors (see below), whose sum is σ = 1223727804. Its totient is φ = 1220514400.

The previous prime is 1222121099. The next prime is 1222121107. The reversal of 1222121101 is 1011212221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1011212221 = 167 ⋅6055163.

It can be written as a sum of positive squares in 2 ways, for example, as 72233001 + 1149888100 = 8499^2 + 33910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222121101 - 2¹ = 1222121099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222121107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 802210 + ... + 803731.

It is an arithmetic number, because the mean of its divisors is an integer number (305931951).

Almost surely, 2^1222121101 is an apocalyptic number.

It is an amenable number.

1222121101 is a deficient number, since it is larger than the sum of its proper divisors (1606703).

1222121101 is an equidigital number, since it uses as much as digits as its factorization.

1222121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606702.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1222121101 is about 34958.8486795547. The cubic root of 1222121101 is about 1069.1486228407.

Adding to 1222121101 its reverse (1011212221), we get a palindrome (2233333322).

The spelling of 1222121101 in words is "one billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred one".