20011211203 has 4 divisors (see below), whose sum is σ = 20881263888. Its totient is φ = 19141158520.

The previous prime is 20011211201. The next prime is 20011211263. The reversal of 20011211203 is 30211211002.

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 20011211203 - 2¹ = 20011211201 is a prime.

It is a super-2 number, since 2×20011211203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011211201) 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, 435026308 + ... + 435026353.

It is an arithmetic number, because the mean of its divisors is an integer number (5220315972).

Almost surely, 2^20011211203 is an apocalyptic number.

20011211203 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20011211203 is a deficient number, since it is larger than the sum of its proper divisors (870052685).

20011211203 is an equidigital number, since it uses as much as digits as its factorization.

20011211203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870052684.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20011211203 its reverse (30211211002), we get a palindrome (50222422205).

The spelling of 20011211203 in words is "twenty billion, eleven million, two hundred eleven thousand, two hundred three".