1211212220003 has 4 divisors (see below), whose sum is σ = 1211214770208. Its totient is φ = 1211209669800.

The previous prime is 1211212219981. The next prime is 1211212220027. The reversal of 1211212220003 is 3000222121121.

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 1211212220003 - 2⁸ = 1211212219747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211212220063) 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, 328376 + ... + 1590677.

It is an arithmetic number, because the mean of its divisors is an integer number (302803692552).

Almost surely, 2^{1211212220003} is an apocalyptic number.

1211212220003 is a deficient number, since it is larger than the sum of its proper divisors (2550205).

1211212220003 is an equidigital number, since it uses as much as digits as its factorization.

1211212220003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550204.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1211212220003 its reverse (3000222121121), we get a palindrome (4211434341124).

The spelling of 1211212220003 in words is "one trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty thousand, three".