21012022021999 has 4 divisors (see below), whose sum is σ = 21012267023136. Its totient is φ = 21011777020864.

The previous prime is 21012022021979. The next prime is 21012022022077. The reversal of 21012022021999 is 99912022021012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21012022021999 - 2¹¹ = 21012022019951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012022021979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122371879 + ... + 122543464.

It is an arithmetic number, because the mean of its divisors is an integer number (5253066755784).

Almost surely, 2^{21012022021999} is an apocalyptic number.

21012022021999 is a deficient number, since it is larger than the sum of its proper divisors (245001137).

21012022021999 is an equidigital number, since it uses as much as digits as its factorization.

21012022021999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245001136.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 21012022021999 in words is "twenty-one trillion, twelve billion, twenty-two million, twenty-one thousand, nine hundred ninety-nine".