21201200993 has 4 divisors (see below), whose sum is σ = 24229944000. Its totient is φ = 18172457988.

The previous prime is 21201200987. The next prime is 21201201061. The reversal of 21201200993 is 39900210212.

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 not a de Polignac number, because 21201200993 - 2¹⁸ = 21200938849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201200953) 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, 1514371493 + ... + 1514371506.

It is an arithmetic number, because the mean of its divisors is an integer number (6057486000).

Almost surely, 2^21201200993 is an apocalyptic number.

It is an amenable number.

21201200993 is a deficient number, since it is larger than the sum of its proper divisors (3028743007).

21201200993 is an equidigital number, since it uses as much as digits as its factorization.

21201200993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028743006.

The product of its (nonzero) digits is 1944, while the sum is 29.

The spelling of 21201200993 in words is "twenty-one billion, two hundred one million, two hundred thousand, nine hundred ninety-three".