1101209021 has 6 divisors (see below), whose sum is σ = 1210419966. Its totient is φ = 1001099000.

The previous prime is 1101208993. The next prime is 1101209023. The reversal of 1101209021 is 1209021011.

It can be written as a sum of positive squares in only one way, i.e., 1081752100 + 19456921 = 32890^2 + 4411^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1101209021 is a prime.

It is a super-2 number, since 2×1101209021² = 2425322615863556882, 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 (1101209023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4550330 + ... + 4550571.

It is an arithmetic number, because the mean of its divisors is an integer number (201736661).

Almost surely, 2^1101209021 is an apocalyptic number.

1101209021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1101209021 is a deficient number, since it is larger than the sum of its proper divisors (109210945).

1101209021 is an equidigital number, since it uses as much as digits as its factorization.

1101209021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9100923 (or 9100912 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1101209021 is about 33184.4695753902. The cubic root of 1101209021 is about 1032.6581734470.

The spelling of 1101209021 in words is "one billion, one hundred one million, two hundred nine thousand, twenty-one".