20123212201 has 4 divisors (see below), whose sum is σ = 20817116100. Its totient is φ = 19429308304.

The previous prime is 20123212183. The next prime is 20123212243. The reversal of 20123212201 is 10221232102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7144306576 + 12978905625 = 84524^2 + 113925^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123212201 - 2⁵ = 20123212169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123210201) 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, 346951906 + ... + 346951963.

It is an arithmetic number, because the mean of its divisors is an integer number (5204279025).

Almost surely, 2^20123212201 is an apocalyptic number.

It is an amenable number.

20123212201 is a deficient number, since it is larger than the sum of its proper divisors (693903899).

20123212201 is an equidigital number, since it uses as much as digits as its factorization.

20123212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693903898.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20123212201 its reverse (10221232102), we get a palindrome (30344444303).

It can be divided in two parts, 20123 and 212201, that added together give a square (232324 = 482²).

The spelling of 20123212201 in words is "twenty billion, one hundred twenty-three million, two hundred twelve thousand, two hundred one".