21020102201201 has 4 divisors (see below), whose sum is σ = 21256283124900. Its totient is φ = 20783921277504.

The previous prime is 21020102201167. The next prime is 21020102201237. The reversal of 21020102201201 is 10210220102012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4646352691600 + 16373749509601 = 2155540^2 + 4046449^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020102201201 - 2¹⁴ = 21020102184817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020102201261) 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, 118090461716 + ... + 118090461893.

It is an arithmetic number, because the mean of its divisors is an integer number (5314070781225).

Almost surely, 2^{21020102201201} is an apocalyptic number.

It is an amenable number.

21020102201201 is a deficient number, since it is larger than the sum of its proper divisors (236180923699).

21020102201201 is an equidigital number, since it uses as much as digits as its factorization.

21020102201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236180923698.

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

Adding to 21020102201201 its reverse (10210220102012), we get a palindrome (31230322303213).

The spelling of 21020102201201 in words is "twenty-one trillion, twenty billion, one hundred two million, two hundred one thousand, two hundred one".