21912226833840 has 80 divisors (see below), whose sum is σ = 77631889360128. Its totient is φ = 5008508990208.

The previous prime is 21912226833781. The next prime is 21912226833841. The reversal of 21912226833840 is 4833862221912.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (21912226833841) 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, 6521494402 + ... + 6521497761.

Almost surely, 2^{21912226833840} is an apocalyptic number.

21912226833840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21912226833840 is an abundant number, since it is smaller than the sum of its proper divisors (55719662526288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21912226833840 is a wasteful number, since it uses less digits than its factorization.

21912226833840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13042992186 (or 13042992180 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 51.

The spelling of 21912226833840 in words is "twenty-one trillion, nine hundred twelve billion, two hundred twenty-six million, eight hundred thirty-three thousand, eight hundred forty".