21000310200997 has 4 divisors (see below), whose sum is σ = 22105589685280. Its totient is φ = 19895030716716.

The previous prime is 21000310200953. The next prime is 21000310201021. The reversal of 21000310200997 is 79900201300012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000310200997 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 (21000310200697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552639742113 + ... + 552639742150.

It is an arithmetic number, because the mean of its divisors is an integer number (5526397421320).

Almost surely, 2^{21000310200997} is an apocalyptic number.

It is an amenable number.

21000310200997 is a deficient number, since it is larger than the sum of its proper divisors (1105279484283).

21000310200997 is a wasteful number, since it uses less digits than its factorization.

21000310200997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105279484282.

The product of its (nonzero) digits is 6804, while the sum is 34.

The spelling of 21000310200997 in words is "twenty-one trillion, three hundred ten million, two hundred thousand, nine hundred ninety-seven".