21201222021985 has 8 divisors (see below), whose sum is σ = 25982774222976. Its totient is φ = 16600105753200.

The previous prime is 21201222021979. The next prime is 21201222022051. The reversal of 21201222021985 is 58912022210212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21201222021985 - 2³ = 21201222021977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45108982791 + ... + 45108983260.

It is an arithmetic number, because the mean of its divisors is an integer number (3247846777872).

Almost surely, 2^{21201222021985} is an apocalyptic number.

It is an amenable number.

21201222021985 is a deficient number, since it is larger than the sum of its proper divisors (4781552200991).

21201222021985 is an equidigital number, since it uses as much as digits as its factorization.

21201222021985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90217966103.

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 21201222021985 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, twenty-one thousand, nine hundred eighty-five".