21002122001201 has 4 divisors (see below), whose sum is σ = 22911405819504. Its totient is φ = 19092838182900.

The previous prime is 21002122001167. The next prime is 21002122001279. The reversal of 21002122001201 is 10210022120012.

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 21002122001201 - 2¹⁴ = 21002121984817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002122001501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954641909135 + ... + 954641909156.

It is an arithmetic number, because the mean of its divisors is an integer number (5727851454876).

Almost surely, 2^{21002122001201} is an apocalyptic number.

It is an amenable number.

21002122001201 is a deficient number, since it is larger than the sum of its proper divisors (1909283818303).

21002122001201 is a wasteful number, since it uses less digits than its factorization.

21002122001201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909283818302.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21002122001201 its reverse (10210022120012), we get a palindrome (31212144121213).

It can be divided in two parts, 210021 and 22001201, that added together give a palindrome (22211222).

The spelling of 21002122001201 in words is "twenty-one trillion, two billion, one hundred twenty-two million, one thousand, two hundred one".