20122012021 has 16 divisors (see below), whose sum is σ = 20758465728. Its totient is φ = 19492905600.

The previous prime is 20122012019. The next prime is 20122012033. The reversal of 20122012021 is 12021022102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20122012021 - 2¹ = 20122012019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20122011992 and 20122012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122012061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4609786 + ... + 4614148.

It is an arithmetic number, because the mean of its divisors is an integer number (1297404108).

Almost surely, 2^20122012021 is an apocalyptic number.

It is an amenable number.

20122012021 is a deficient number, since it is larger than the sum of its proper divisors (636453707).

20122012021 is a wasteful number, since it uses less digits than its factorization.

20122012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172.

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

Adding to 20122012021 its reverse (12021022102), we get a palindrome (32143034123).

The spelling of 20122012021 in words is "twenty billion, one hundred twenty-two million, twelve thousand, twenty-one".