21201211010211 has 8 divisors (see below), whose sum is σ = 28271606669904. Its totient is φ = 14132478012000.

The previous prime is 21201211010171. The next prime is 21201211010269. The reversal of 21201211010211 is 11201011210212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21201211010211 - 2¹⁷ = 21201210879139 is a prime.

It is a super-2 number, since 2×21201211010211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21201211015211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415635616 + ... + 415686621.

It is an arithmetic number, because the mean of its divisors is an integer number (3533950833738).

Almost surely, 2^{21201211010211} is an apocalyptic number.

21201211010211 is a deficient number, since it is larger than the sum of its proper divisors (7070395659693).

21201211010211 is an equidigital number, since it uses as much as digits as its factorization.

21201211010211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831330741.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21201211010211 its reverse (11201011210212), we get a palindrome (32402222220423).

The spelling of 21201211010211 in words is "twenty-one trillion, two hundred one billion, two hundred eleven million, ten thousand, two hundred eleven".