1221011121203 has 8 divisors (see below), whose sum is σ = 1225617246720. Its totient is φ = 1216405735560.

The previous prime is 1221011121193. The next prime is 1221011121223. The reversal of 1221011121203 is 3021211101221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221011121203 - 2³⁶ = 1152291644467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221011121223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3241226 + ... + 3598272.

It is an arithmetic number, because the mean of its divisors is an integer number (153202155840).

Almost surely, 2^{1221011121203} is an apocalyptic number.

1221011121203 is a deficient number, since it is larger than the sum of its proper divisors (4606125517).

1221011121203 is a wasteful number, since it uses less digits than its factorization.

1221011121203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369937.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1221011121203 its reverse (3021211101221), we get a palindrome (4242222222424).

The spelling of 1221011121203 in words is "one trillion, two hundred twenty-one billion, eleven million, one hundred twenty-one thousand, two hundred three".