20111222011021 has 4 divisors (see below), whose sum is σ = 20255907061600. Its totient is φ = 19966536960444.

The previous prime is 20111222010917. The next prime is 20111222011039. The reversal of 20111222011021 is 12011022211102.

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 not a de Polignac number, because 20111222011021 - 2¹¹ = 20111222008973 is a prime.

It is a super-2 number, since 2×20111222011021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111222010986 and 20111222011004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111222011121) 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, 72342525081 + ... + 72342525358.

It is an arithmetic number, because the mean of its divisors is an integer number (5063976765400).

Almost surely, 2^{20111222011021} is an apocalyptic number.

It is an amenable number.

20111222011021 is a deficient number, since it is larger than the sum of its proper divisors (144685050579).

20111222011021 is a wasteful number, since it uses less digits than its factorization.

20111222011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144685050578.

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

Adding to 20111222011021 its reverse (12011022211102), we get a palindrome (32122244222123).

The spelling of 20111222011021 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-two million, eleven thousand, twenty-one".