21005265200207 has 8 divisors (see below), whose sum is σ = 22010246968320. Its totient is φ = 20007925879480.

The previous prime is 21005265200197. The next prime is 21005265200209. The reversal of 21005265200207 is 70200256250012.

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 21005265200207 - 2⁴ = 21005265200191 is a prime.

It is a super-2 number, since 2×21005265200207² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21005265200209) 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, 1910606219 + ... + 1910617212.

It is an arithmetic number, because the mean of its divisors is an integer number (2751280871040).

Almost surely, 2^{21005265200207} is an apocalyptic number.

21005265200207 is a deficient number, since it is larger than the sum of its proper divisors (1004981768113).

21005265200207 is a wasteful number, since it uses less digits than its factorization.

21005265200207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821223693.

The product of its (nonzero) digits is 16800, while the sum is 32.

The spelling of 21005265200207 in words is "twenty-one trillion, five billion, two hundred sixty-five million, two hundred thousand, two hundred seven".