212123001 has 4 divisors (see below), whose sum is σ = 282830672. Its totient is φ = 141415332.

The previous prime is 212122993. The next prime is 212123003. The reversal of 212123001 is 100321212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 212123001 - 2³ = 212122993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212123003) 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, 35353831 + ... + 35353836.

It is an arithmetic number, because the mean of its divisors is an integer number (70707668).

Almost surely, 2^212123001 is an apocalyptic number.

It is an amenable number.

212123001 is a deficient number, since it is larger than the sum of its proper divisors (70707671).

212123001 is an equidigital number, since it uses as much as digits as its factorization.

212123001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70707670.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 212123001 is about 14564.4430377547. The cubic root of 212123001 is about 596.3884914028.

Adding to 212123001 its reverse (100321212), we get a palindrome (312444213).

The spelling of 212123001 in words is "two hundred twelve million, one hundred twenty-three thousand, one".