21001333199 has 16 divisors (see below), whose sum is σ = 26822105856. Its totient is φ = 15965534400.

The previous prime is 21001333181. The next prime is 21001333201. The reversal of 21001333199 is 99133310012.

It is a cyclic number.

It is not a de Polignac number, because 21001333199 - 2¹² = 21001329103 is a prime.

It is a super-2 number, since 2×21001333199² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001333159) 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, 3322997 + ... + 3329310.

It is an arithmetic number, because the mean of its divisors is an integer number (1676381616).

Almost surely, 2^21001333199 is an apocalyptic number.

21001333199 is a deficient number, since it is larger than the sum of its proper divisors (5820772657).

21001333199 is a wasteful number, since it uses less digits than its factorization.

21001333199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6652366.

The product of its (nonzero) digits is 4374, while the sum is 32.

The spelling of 21001333199 in words is "twenty-one billion, one million, three hundred thirty-three thousand, one hundred ninety-nine".