1100021021 has 8 divisors (see below), whose sum is σ = 1229292288. Its totient is φ = 975628000.

The previous prime is 1100021003. The next prime is 1100021029. The reversal of 1100021021 is 1201200011.

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 1100021021 - 2¹⁴ = 1100004637 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 (1100021029) 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, 1219085 + ... + 1219986.

It is an arithmetic number, because the mean of its divisors is an integer number (153661536).

Almost surely, 2^1100021021 is an apocalyptic number.

1100021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1100021021 is a deficient number, since it is larger than the sum of its proper divisors (129271267).

1100021021 is a wasteful number, since it uses less digits than its factorization.

1100021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439123.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1100021021 is about 33166.5648055387. The cubic root of 1100021021 is about 1032.2866910388.

Adding to 1100021021 its reverse (1201200011), we get a palindrome (2301221032).

The spelling of 1100021021 in words is "one billion, one hundred million, twenty-one thousand, twenty-one".