21002102121201 has 8 divisors (see below), whose sum is σ = 28003044486144. Its totient is φ = 14001280585200.

The previous prime is 21002102121179. The next prime is 21002102121211. The reversal of 21002102121201 is 10212120120012.

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

It is not a de Polignac number, because 21002102121201 - 2⁶ = 21002102121137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002102121211) 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, 29800881 + ... + 30497486.

It is an arithmetic number, because the mean of its divisors is an integer number (3500380560768).

Almost surely, 2^{21002102121201} is an apocalyptic number.

It is an amenable number.

21002102121201 is a deficient number, since it is larger than the sum of its proper divisors (7000942364943).

21002102121201 is a wasteful number, since it uses less digits than its factorization.

21002102121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60414471.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002102121201 its reverse (10212120120012), we get a palindrome (31214222241213).

The spelling of 21002102121201 in words is "twenty-one trillion, two billion, one hundred two million, one hundred twenty-one thousand, two hundred one".