20122232021 has 4 divisors (see below), whose sum is σ = 20143616844. Its totient is φ = 20100847200.

The previous prime is 20122231999. The next prime is 20122232023. The reversal of 20122232021 is 12023222102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12023222102 = 2 ⋅6011611051.

It can be written as a sum of positive squares in 2 ways, for example, as 6223000996 + 13899231025 = 78886^2 + 117895^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122232021 - 2⁶ = 20122231957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122232023) 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, 10691000 + ... + 10692881.

It is an arithmetic number, because the mean of its divisors is an integer number (5035904211).

Almost surely, 2^20122232021 is an apocalyptic number.

It is an amenable number.

20122232021 is a deficient number, since it is larger than the sum of its proper divisors (21384823).

20122232021 is an equidigital number, since it uses as much as digits as its factorization.

20122232021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21384822.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20122232021 its reverse (12023222102), we get a palindrome (32145454123).

The spelling of 20122232021 in words is "twenty billion, one hundred twenty-two million, two hundred thirty-two thousand, twenty-one".