201212100023 has 4 divisors (see below), whose sum is σ = 219504109128. Its totient is φ = 182920090920.

The previous prime is 201212099987. The next prime is 201212100049. The reversal of 201212100023 is 320001212102.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 201212100023 - 2¹⁰ = 201212098999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201212099980 and 201212100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212100053) 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, 9146004536 + ... + 9146004557.

It is an arithmetic number, because the mean of its divisors is an integer number (54876027282).

Almost surely, 2^201212100023 is an apocalyptic number.

201212100023 is a deficient number, since it is larger than the sum of its proper divisors (18292009105).

201212100023 is a wasteful number, since it uses less digits than its factorization.

201212100023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18292009104.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 201212100023 its reverse (320001212102), we get a palindrome (521213312125).

The spelling of 201212100023 in words is "two hundred one billion, two hundred twelve million, one hundred thousand, twenty-three".