20102121211211 has 16 divisors (see below), whose sum is σ = 21701665649664. Its totient is φ = 18510205869984.

The previous prime is 20102121211199. The next prime is 20102121211231. The reversal of 20102121211211 is 11211212120102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102121211211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20102121211211.

It is not an unprimeable number, because it can be changed into a prime (20102121211231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18704096 + ... + 19749618.

It is an arithmetic number, because the mean of its divisors is an integer number (1356354103104).

Almost surely, 2^{20102121211211} is an apocalyptic number.

20102121211211 is a deficient number, since it is larger than the sum of its proper divisors (1599544438453).

20102121211211 is a wasteful number, since it uses less digits than its factorization.

20102121211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049170.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20102121211211 its reverse (11211212120102), we get a palindrome (31313333331313).

The spelling of 20102121211211 in words is "twenty trillion, one hundred two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred eleven".