21002102120201 has 8 divisors (see below), whose sum is σ = 21013727011464. Its totient is φ = 20990480209920.

The previous prime is 21002102120171. The next prime is 21002102120213. The reversal of 21002102120201 is 10202120120012.

It can be written as a sum of positive squares in 4 ways, for example, as 2370749996176 + 18631352124025 = 1539724^2 + 4316405^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21002102120201 - 2²⁶ = 21002035011337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21002102120221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13423811 + ... + 14906471.

It is an arithmetic number, because the mean of its divisors is an integer number (2626715876433).

Almost surely, 2^{21002102120201} is an apocalyptic number.

It is an amenable number.

21002102120201 is a deficient number, since it is larger than the sum of its proper divisors (11624891263).

21002102120201 is a wasteful number, since it uses less digits than its factorization.

21002102120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490491.

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

Adding to 21002102120201 its reverse (10202120120012), we get a palindrome (31204222240213).

The spelling of 21002102120201 in words is "twenty-one trillion, two billion, one hundred two million, one hundred twenty thousand, two hundred one".