1221402534353 has 4 divisors (see below), whose sum is σ = 1223414730240. Its totient is φ = 1219390338468.

The previous prime is 1221402534293. The next prime is 1221402534371. The reversal of 1221402534353 is 3534352041221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221402534353 - 2²² = 1221398340049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221402534953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1006097033 + ... + 1006098246.

It is an arithmetic number, because the mean of its divisors is an integer number (305853682560).

Almost surely, 2^{1221402534353} is an apocalyptic number.

It is an amenable number.

1221402534353 is a deficient number, since it is larger than the sum of its proper divisors (2012195887).

1221402534353 is an equidigital number, since it uses as much as digits as its factorization.

1221402534353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012195886.

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 1221402534353 its reverse (3534352041221), we get a palindrome (4755754575574).

The spelling of 1221402534353 in words is "one trillion, two hundred twenty-one billion, four hundred two million, five hundred thirty-four thousand, three hundred fifty-three".