1221001202003 has 4 divisors (see below), whose sum is σ = 1332001311288. Its totient is φ = 1110001092720.

The previous prime is 1221001201997. The next prime is 1221001202027. The reversal of 1221001202003 is 3002021001221.

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 1221001202003 - 2⁶ = 1221001201939 is a prime.

It is a super-2 number, since 2×1221001202003² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221001202033) 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, 55500054626 + ... + 55500054647.

It is an arithmetic number, because the mean of its divisors is an integer number (333000327822).

Almost surely, 2^{1221001202003} is an apocalyptic number.

1221001202003 is a deficient number, since it is larger than the sum of its proper divisors (111000109285).

1221001202003 is a wasteful number, since it uses less digits than its factorization.

1221001202003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111000109284.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1221001202003 its reverse (3002021001221), we get a palindrome (4223022203224).

The spelling of 1221001202003 in words is "one trillion, two hundred twenty-one billion, one million, two hundred two thousand, three".