21001202202001 has 4 divisors (see below), whose sum is σ = 24001373945152. Its totient is φ = 18001030458852.

The previous prime is 21001202201923. The next prime is 21001202202017. The reversal of 21001202202001 is 10020220210012.

It is a happy number.

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 not a de Polignac number, because 21001202202001 - 2⁹ = 21001202201489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001202202031) 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, 1500085871565 + ... + 1500085871578.

It is an arithmetic number, because the mean of its divisors is an integer number (6000343486288).

Almost surely, 2^{21001202202001} is an apocalyptic number.

It is an amenable number.

21001202202001 is a deficient number, since it is larger than the sum of its proper divisors (3000171743151).

21001202202001 is an equidigital number, since it uses as much as digits as its factorization.

21001202202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000171743150.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21001202202001 its reverse (10020220210012), we get a palindrome (31021422412013).

The spelling of 21001202202001 in words is "twenty-one trillion, one billion, two hundred two million, two hundred two thousand, one".