21011202001211 has 4 divisors (see below), whose sum is σ = 21016621453632. Its totient is φ = 21005782548792.

The previous prime is 21011202001187. The next prime is 21011202001219. The reversal of 21011202001211 is 11210020211012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011202001211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011202001219) 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, 2709720395 + ... + 2709728148.

It is an arithmetic number, because the mean of its divisors is an integer number (5254155363408).

Almost surely, 2^{21011202001211} is an apocalyptic number.

21011202001211 is a deficient number, since it is larger than the sum of its proper divisors (5419452421).

21011202001211 is an equidigital number, since it uses as much as digits as its factorization.

21011202001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5419452420.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21011202001211 its reverse (11210020211012), we get a palindrome (32221222212223).

The spelling of 21011202001211 in words is "twenty-one trillion, eleven billion, two hundred two million, one thousand, two hundred eleven".