1213501404550 has 24 divisors (see below), whose sum is σ = 2284306748136. Its totient is φ = 479552360640.

The previous prime is 1213501404541. The next prime is 1213501404611. The reversal of 1213501404550 is 554041053121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146200839 + ... + 146209138.

It is an arithmetic number, because the mean of its divisors is an integer number (95179447839).

Almost surely, 2^{1213501404550} is an apocalyptic number.

1213501404550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213501404550 is a deficient number, since it is larger than the sum of its proper divisors (1070805343586).

1213501404550 is a wasteful number, since it uses less digits than its factorization.

1213501404550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292410072 (or 292410067 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 1213501404550 its reverse (554041053121), we get a palindrome (1767542457671).

The spelling of 1213501404550 in words is "one trillion, two hundred thirteen billion, five hundred one million, four hundred four thousand, five hundred fifty".