1221313122554 has 16 divisors (see below), whose sum is σ = 2100368718528. Its totient is φ = 521747639712.

The previous prime is 1221313122553. The next prime is 1221313122599. The reversal of 1221313122554 is 4552213131221.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221313122554.

It is not an unprimeable number, because it can be changed into a prime (1221313122553) 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, 139351292 + ... + 139360055.

It is an arithmetic number, because the mean of its divisors is an integer number (131273044908).

Almost surely, 2^{1221313122554} is an apocalyptic number.

1221313122554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1221313122554 is a deficient number, since it is larger than the sum of its proper divisors (879055595974).

1221313122554 is a wasteful number, since it uses less digits than its factorization.

1221313122554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278711669.

The product of its digits is 14400, while the sum is 32.

Adding to 1221313122554 its reverse (4552213131221), we get a palindrome (5773526253775).

The spelling of 1221313122554 in words is "one trillion, two hundred twenty-one billion, three hundred thirteen million, one hundred twenty-two thousand, five hundred fifty-four".