1221503554011 has 8 divisors (see below), whose sum is σ = 1753953821200. Its totient is φ = 751694494752.

The previous prime is 1221503554001. The next prime is 1221503554049. The reversal of 1221503554011 is 1104553051221.

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

It is not a de Polignac number, because 1221503554011 - 2⁶ = 1221503553947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221503554011.

It is not an unprimeable number, because it can be changed into a prime (1221503554001) 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, 15660301936 + ... + 15660302013.

It is an arithmetic number, because the mean of its divisors is an integer number (219244227650).

Almost surely, 2^{1221503554011} is an apocalyptic number.

1221503554011 is a deficient number, since it is larger than the sum of its proper divisors (532450267189).

1221503554011 is a wasteful number, since it uses less digits than its factorization.

1221503554011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31320603965.

The product of its (nonzero) digits is 6000, while the sum is 30.

The spelling of 1221503554011 in words is "one trillion, two hundred twenty-one billion, five hundred three million, five hundred fifty-four thousand, eleven".