21201444001097 has 4 divisors (see below), whose sum is σ = 21262543263696. Its totient is φ = 21140344738500.

The previous prime is 21201444001063. The next prime is 21201444001099. The reversal of 21201444001097 is 79010044410212.

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 21201444001097 - 2¹² = 21201443997001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201444001099) 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, 30549630779 + ... + 30549631472.

It is an arithmetic number, because the mean of its divisors is an integer number (5315635815924).

Almost surely, 2^{21201444001097} is an apocalyptic number.

It is an amenable number.

21201444001097 is a deficient number, since it is larger than the sum of its proper divisors (61099262599).

21201444001097 is an equidigital number, since it uses as much as digits as its factorization.

21201444001097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61099262598.

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 21201444001097 in words is "twenty-one trillion, two hundred one billion, four hundred forty-four million, one thousand, ninety-seven".