20113021221221 has 4 divisors (see below), whose sum is σ = 20114936940000. Its totient is φ = 20111105502444.

The previous prime is 20113021221191. The next prime is 20113021221269. The reversal of 20113021221221 is 12212212031102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20113021221221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20113021221193 and 20113021221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113021221281) 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, 957843641 + ... + 957864638.

It is an arithmetic number, because the mean of its divisors is an integer number (5028734235000).

Almost surely, 2^{20113021221221} is an apocalyptic number.

It is an amenable number.

20113021221221 is a deficient number, since it is larger than the sum of its proper divisors (1915718779).

20113021221221 is a wasteful number, since it uses less digits than its factorization.

20113021221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915718778.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 20113021221221 its reverse (12212212031102), we get a palindrome (32325233252323).

The spelling of 20113021221221 in words is "twenty trillion, one hundred thirteen billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".