20110211121021 has 16 divisors (see below), whose sum is σ = 30689395849344. Its totient is φ = 11474574980544.

The previous prime is 20110211121017. The next prime is 20110211121067. The reversal of 20110211121021 is 12012111201102.

It is a happy number.

It is not a de Polignac number, because 20110211121021 - 2² = 20110211121017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110211123021) 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, 707245090 + ... + 707273523.

It is an arithmetic number, because the mean of its divisors is an integer number (1918087240584).

Almost surely, 2^{20110211121021} is an apocalyptic number.

20110211121021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20110211121021 is a deficient number, since it is larger than the sum of its proper divisors (10579184728323).

20110211121021 is a wasteful number, since it uses less digits than its factorization.

20110211121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414519300.

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

Adding to 20110211121021 its reverse (12012111201102), we get a palindrome (32122322322123).

The spelling of 20110211121021 in words is "twenty trillion, one hundred ten billion, two hundred eleven million, one hundred twenty-one thousand, twenty-one".