1211021099 has 8 divisors (see below), whose sum is σ = 1233216000. Its totient is φ = 1188997992.

The previous prime is 1211021087. The next prime is 1211021111. The reversal of 1211021099 is 9901201121.

It is an interprime number because it is at equal distance from previous prime (1211021087) and next prime (1211021111).

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

It is a cyclic number.

It is not a de Polignac number, because 1211021099 - 2²⁸ = 942585643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211026099) 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, 28679 + ... + 56960.

It is an arithmetic number, because the mean of its divisors is an integer number (154152000).

Almost surely, 2^1211021099 is an apocalyptic number.

1211021099 is a deficient number, since it is larger than the sum of its proper divisors (22194901).

1211021099 is an equidigital number, since it uses as much as digits as its factorization.

1211021099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85897.

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

The square root of 1211021099 is about 34799.7284328484. The cubic root of 1211021099 is about 1065.9019005268.

The spelling of 1211021099 in words is "one billion, two hundred eleven million, twenty-one thousand, ninety-nine".