1221220210003 has 4 divisors (see below), whose sum is σ = 1221284785680. Its totient is φ = 1221155634328.

The previous prime is 1221220209983. The next prime is 1221220210039. The reversal of 1221220210003 is 3000120221221.

It is a happy number.

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 1221220210003 - 2⁹ = 1221220209491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221220210703) 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, 32259463 + ... + 32297296.

It is an arithmetic number, because the mean of its divisors is an integer number (305321196420).

Almost surely, 2^{1221220210003} is an apocalyptic number.

1221220210003 is a deficient number, since it is larger than the sum of its proper divisors (64575677).

1221220210003 is an equidigital number, since it uses as much as digits as its factorization.

1221220210003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64575676.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 1221220210003 its reverse (3000120221221), we get a palindrome (4221340431224).

The spelling of 1221220210003 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, three".