1098841821 has 16 divisors (see below), whose sum is σ = 1826646528. Its totient is φ = 570826800.

The previous prime is 1098841759. The next prime is 1098841837. The reversal of 1098841821 is 1281488901.

It is not a de Polignac number, because 1098841821 - 2⁹ = 1098841309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098841021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2378215 + ... + 2378676.

It is an arithmetic number, because the mean of its divisors is an integer number (114165408).

Almost surely, 2^1098841821 is an apocalyptic number.

1098841821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1098841821 is a deficient number, since it is larger than the sum of its proper divisors (727804707).

1098841821 is a wasteful number, since it uses less digits than its factorization.

1098841821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4756912.

The product of its (nonzero) digits is 36864, while the sum is 42.

The square root of 1098841821 is about 33148.7830998364. The cubic root of 1098841821 is about 1031.9176957603.

The spelling of 1098841821 in words is "one billion, ninety-eight million, eight hundred forty-one thousand, eight hundred twenty-one".