2109954021 has 16 divisors (see below), whose sum is σ = 3216563328. Its totient is φ = 1205164800.

The previous prime is 2109953981. The next prime is 2109954029. The reversal of 2109954021 is 1204599012.

It is not a de Polignac number, because 2109954021 - 2⁹ = 2109953509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109954029) 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, 30681 + ... + 71841.

It is an arithmetic number, because the mean of its divisors is an integer number (201035208).

Almost surely, 2^2109954021 is an apocalyptic number.

2109954021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2109954021 is a deficient number, since it is larger than the sum of its proper divisors (1106609307).

2109954021 is a wasteful number, since it uses less digits than its factorization.

2109954021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43612.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 2109954021 is about 45934.2358268862. The cubic root of 2109954021 is about 1282.5992958773.

The spelling of 2109954021 in words is "two billion, one hundred nine million, nine hundred fifty-four thousand, twenty-one".