20112220021 has 16 divisors (see below), whose sum is σ = 21264629760. Its totient is φ = 18992176560.

The previous prime is 20112220001. The next prime is 20112220069. The reversal of 20112220021 is 12002221102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20112220021 - 2⁵ = 20112219989 is a prime.

It is a super-2 number, since 2×20112220021² (a number of 21 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 = 20112219983 and 20112220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112220001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1463460 + ... + 1477138.

It is an arithmetic number, because the mean of its divisors is an integer number (1329039360).

Almost surely, 2^20112220021 is an apocalyptic number.

It is an amenable number.

20112220021 is a deficient number, since it is larger than the sum of its proper divisors (1152409739).

20112220021 is a wasteful number, since it uses less digits than its factorization.

20112220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14856.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20112220021 its reverse (12002221102), we get a palindrome (32114441123).

The spelling of 20112220021 in words is "twenty billion, one hundred twelve million, two hundred twenty thousand, twenty-one".