21012001201 has 4 divisors (see below), whose sum is σ = 21208375152. Its totient is φ = 20815627252.

The previous prime is 21012001163. The next prime is 21012001211. The reversal of 21012001201 is 10210021012.

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 21012001201 - 2⁹ = 21012000689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012001211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98186815 + ... + 98187028.

It is an arithmetic number, because the mean of its divisors is an integer number (5302093788).

Almost surely, 2^21012001201 is an apocalyptic number.

It is an amenable number.

21012001201 is a deficient number, since it is larger than the sum of its proper divisors (196373951).

21012001201 is a wasteful number, since it uses less digits than its factorization.

21012001201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196373950.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21012001201 its reverse (10210021012), we get a palindrome (31222022213).

The spelling of 21012001201 in words is "twenty-one billion, twelve million, one thousand, two hundred one".