11820921203 has 16 divisors (see below), whose sum is σ = 14551971840. Its totient is φ = 9350794656.

The previous prime is 11820921179. The next prime is 11820921227. The reversal of 11820921203 is 30212902811.

It is an interprime number because it is at equal distance from previous prime (11820921179) and next prime (11820921227).

It is not a de Polignac number, because 11820921203 - 2²² = 11816726899 is a prime.

It is a super-3 number, since 3×11820921203³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (11820921263) 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, 520226 + ... + 542472.

It is an arithmetic number, because the mean of its divisors is an integer number (909498240).

Almost surely, 2^11820921203 is an apocalyptic number.

11820921203 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11820921203 is a deficient number, since it is larger than the sum of its proper divisors (2731050637).

11820921203 is a wasteful number, since it uses less digits than its factorization.

11820921203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28106.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 11820921203 in words is "eleven billion, eight hundred twenty million, nine hundred twenty-one thousand, two hundred three".