211220312003 has 4 divisors (see below), whose sum is σ = 211223936568. Its totient is φ = 211216687440.

The previous prime is 211220311999. The next prime is 211220312033. The reversal of 211220312003 is 300213022112.

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 211220312003 - 2² = 211220311999 is a prime.

It is a super-2 number, since 2×211220312003² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211220312033) 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, 1723418 + ... + 1841903.

It is an arithmetic number, because the mean of its divisors is an integer number (52805984142).

Almost surely, 2^211220312003 is an apocalyptic number.

211220312003 is a deficient number, since it is larger than the sum of its proper divisors (3624565).

211220312003 is an equidigital number, since it uses as much as digits as its factorization.

211220312003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624564.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 211220312003 its reverse (300213022112), we get a palindrome (511433334115).

The spelling of 211220312003 in words is "two hundred eleven billion, two hundred twenty million, three hundred twelve thousand, three".