21202120001211 has 64 divisors (see below), whose sum is σ = 30904104960000. Its totient is φ = 12875265570816.

The previous prime is 21202120001201. The next prime is 21202120001213. The reversal of 21202120001211 is 11210002120212.

It is not a de Polignac number, because 21202120001211 - 2²³ = 21202111612603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21202120001213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2667264865 + ... + 2667272813.

It is an arithmetic number, because the mean of its divisors is an integer number (482876640000).

Almost surely, 2^{21202120001211} is an apocalyptic number.

21202120001211 is a deficient number, since it is larger than the sum of its proper divisors (9701984958789).

21202120001211 is a wasteful number, since it uses less digits than its factorization.

21202120001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15308.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21202120001211 its reverse (11210002120212), we get a palindrome (32412122121423).

It can be divided in two parts, 21202120001 and 211, that added together give a palindrome (21202120212).

The spelling of 21202120001211 in words is "twenty-one trillion, two hundred two billion, one hundred twenty million, one thousand, two hundred eleven".