1221254404540 has 12 divisors (see below), whose sum is σ = 2564634249576. Its totient is φ = 488501761808.

The previous prime is 1221254404481. The next prime is 1221254404619. The reversal of 1221254404540 is 454044521221.

It is a super-2 number, since 2×1221254404540² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221254404496 and 1221254404505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30531360094 + ... + 30531360133.

It is an arithmetic number, because the mean of its divisors is an integer number (213719520798).

Almost surely, 2^{1221254404540} is an apocalyptic number.

1221254404540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221254404540 is an abundant number, since it is smaller than the sum of its proper divisors (1343379845036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221254404540 is a wasteful number, since it uses less digits than its factorization.

1221254404540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61062720236 (or 61062720234 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 34.

Adding to 1221254404540 its reverse (454044521221), we get a palindrome (1675298925761).

The spelling of 1221254404540 in words is "one trillion, two hundred twenty-one billion, two hundred fifty-four million, four hundred four thousand, five hundred forty".