1221101099 has 4 divisors (see below), whose sum is σ = 1226888520. Its totient is φ = 1215313680.

The previous prime is 1221101083. The next prime is 1221101107. The reversal of 1221101099 is 9901011221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221101099 - 2⁴ = 1221101083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221101059) 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, 2893394 + ... + 2893815.

It is an arithmetic number, because the mean of its divisors is an integer number (306722130).

Almost surely, 2^1221101099 is an apocalyptic number.

1221101099 is a deficient number, since it is larger than the sum of its proper divisors (5787421).

1221101099 is an equidigital number, since it uses as much as digits as its factorization.

1221101099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5787420.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 1221101099 is about 34944.2570245813. The cubic root of 1221101099 is about 1068.8510971520.

The spelling of 1221101099 in words is "one billion, two hundred twenty-one million, one hundred one thousand, ninety-nine".