21202110202001 has 4 divisors (see below), whose sum is σ = 21203092302900. Its totient is φ = 21201128101104.

The previous prime is 21202110201869. The next prime is 21202110202061. The reversal of 21202110202001 is 10020201120212.

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 11371220271376 + 9830889930625 = 3372124^2 + 3135425^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202110202001 - 2³⁴ = 21184930332817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202110202061) 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, 491018066 + ... + 491061243.

It is an arithmetic number, because the mean of its divisors is an integer number (5300773075725).

Almost surely, 2^{21202110202001} is an apocalyptic number.

It is an amenable number.

21202110202001 is a deficient number, since it is larger than the sum of its proper divisors (982100899).

21202110202001 is an equidigital number, since it uses as much as digits as its factorization.

21202110202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982100898.

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

Adding to 21202110202001 its reverse (10020201120212), we get a palindrome (31222311322213).

The spelling of 21202110202001 in words is "twenty-one trillion, two hundred two billion, one hundred ten million, two hundred two thousand, one".