21002211120001 has 4 divisors (see below), whose sum is σ = 21002530917312. Its totient is φ = 21001891322692.

The previous prime is 21002211119971. The next prime is 21002211120049. The reversal of 21002211120001 is 10002111220012.

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 a cyclic number.

It is not a de Polignac number, because 21002211120001 - 2⁵ = 21002211119969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002211120101) 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, 159800125 + ... + 159931498.

It is an arithmetic number, because the mean of its divisors is an integer number (5250632729328).

Almost surely, 2^{21002211120001} is an apocalyptic number.

It is an amenable number.

21002211120001 is a deficient number, since it is larger than the sum of its proper divisors (319797311).

21002211120001 is an equidigital number, since it uses as much as digits as its factorization.

21002211120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319797310.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21002211120001 its reverse (10002111220012), we get a palindrome (31004322340013).

The spelling of 21002211120001 in words is "twenty-one trillion, two billion, two hundred eleven million, one hundred twenty thousand, one".