1221102551534 has 8 divisors (see below), whose sum is σ = 1849436874480. Its totient is φ = 604623593376.

The previous prime is 1221102551507. The next prime is 1221102551579. The reversal of 1221102551534 is 4351552011221.

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

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 1221102551534.

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, 2963840939 + ... + 2963841350.

It is an arithmetic number, because the mean of its divisors is an integer number (231179609310).

Almost surely, 2^{1221102551534} is an apocalyptic number.

1221102551534 is a deficient number, since it is larger than the sum of its proper divisors (628334322946).

1221102551534 is a wasteful number, since it uses less digits than its factorization.

1221102551534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5927682394.

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 1221102551534 its reverse (4351552011221), we get a palindrome (5572654562755).

The spelling of 1221102551534 in words is "one trillion, two hundred twenty-one billion, one hundred two million, five hundred fifty-one thousand, five hundred thirty-four".