1211020203 has 4 divisors (see below), whose sum is σ = 1614693608. Its totient is φ = 807346800.

The previous prime is 1211020183. The next prime is 1211020207. The reversal of 1211020203 is 3020201121.

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

It is not a de Polignac number, because 1211020203 - 2²⁰ = 1209971627 is a prime.

It is a super-2 number, since 2×1211020203² = 2933139864148322418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211020207) 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, 201836698 + ... + 201836703.

It is an arithmetic number, because the mean of its divisors is an integer number (403673402).

Almost surely, 2^1211020203 is an apocalyptic number.

1211020203 is a deficient number, since it is larger than the sum of its proper divisors (403673405).

1211020203 is an equidigital number, since it uses as much as digits as its factorization.

1211020203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403673404.

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

The square root of 1211020203 is about 34799.7155591824. The cubic root of 1211020203 is about 1065.9016376499.

Adding to 1211020203 its reverse (3020201121), we get a palindrome (4231221324).

The spelling of 1211020203 in words is "one billion, two hundred eleven million, twenty thousand, two hundred three".