21022001999 has 8 divisors (see below), whose sum is σ = 21135280800. Its totient is φ = 20908800000.

The previous prime is 21022001977. The next prime is 21022002011. The reversal of 21022001999 is 99910022012.

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

It is a cyclic number.

It is not a de Polignac number, because 21022001999 - 2¹² = 21021997903 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 (21022001599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 579599 + ... + 614799.

It is an arithmetic number, because the mean of its divisors is an integer number (2641910100).

Almost surely, 2^21022001999 is an apocalyptic number.

21022001999 is a deficient number, since it is larger than the sum of its proper divisors (113278801).

21022001999 is a wasteful number, since it uses less digits than its factorization.

21022001999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38401.

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 21022001999 in words is "twenty-one billion, twenty-two million, one thousand, nine hundred ninety-nine".