1221552550534 has 8 divisors (see below), whose sum is σ = 1911995296560. Its totient is φ = 584220785016.

The previous prime is 1221552550531. The next prime is 1221552550549. The reversal of 1221552550534 is 4350552551221.

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

It is a super-2 number, since 2×1221552550534² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221552550531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13277745069 + ... + 13277745160.

It is an arithmetic number, because the mean of its divisors is an integer number (238999412070).

Almost surely, 2^{1221552550534} is an apocalyptic number.

1221552550534 is a deficient number, since it is larger than the sum of its proper divisors (690442746026).

1221552550534 is a wasteful number, since it uses less digits than its factorization.

1221552550534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26555490254.

The product of its (nonzero) digits is 300000, while the sum is 40.

The spelling of 1221552550534 in words is "one trillion, two hundred twenty-one billion, five hundred fifty-two million, five hundred fifty thousand, five hundred thirty-four".