20011122220021 has 4 divisors (see below), whose sum is σ = 20012172636544. Its totient is φ = 20010071803500.

The previous prime is 20011122219953. The next prime is 20011122220123. The reversal of 20011122220021 is 12002222111002.

It is a happy number.

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 20011122220021 - 2⁹ = 20011122219509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011122219977 and 20011122220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011122221021) 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, 525179685 + ... + 525217786.

It is an arithmetic number, because the mean of its divisors is an integer number (5003043159136).

Almost surely, 2^{20011122220021} is an apocalyptic number.

It is an amenable number.

20011122220021 is a deficient number, since it is larger than the sum of its proper divisors (1050416523).

20011122220021 is a wasteful number, since it uses less digits than its factorization.

20011122220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050416522.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20011122220021 its reverse (12002222111002), we get a palindrome (32013344331023).

The spelling of 20011122220021 in words is "twenty trillion, eleven billion, one hundred twenty-two million, two hundred twenty thousand, twenty-one".