20112212011021 has 4 divisors (see below), whose sum is σ = 21659305242652. Its totient is φ = 18565118779392.

The previous prime is 20112212011019. The next prime is 20112212011079. The reversal of 20112212011021 is 12011021221102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2012411774025 + 18099800236996 = 1418595^2 + 4254386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112212011021 - 2¹ = 20112212011019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112212010986 and 20112212011004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112212017021) 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, 773546615796 + ... + 773546615821.

It is an arithmetic number, because the mean of its divisors is an integer number (5414826310663).

Almost surely, 2^{20112212011021} is an apocalyptic number.

It is an amenable number.

20112212011021 is a deficient number, since it is larger than the sum of its proper divisors (1547093231631).

20112212011021 is a wasteful number, since it uses less digits than its factorization.

20112212011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547093231630.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20112212011021 its reverse (12011021221102), we get a palindrome (32123233232123).

The spelling of 20112212011021 in words is "twenty trillion, one hundred twelve billion, two hundred twelve million, eleven thousand, twenty-one".