1221552543043 has 8 divisors (see below), whose sum is σ = 1396390042880. Its totient is φ = 1046797541640.

The previous prime is 1221552543037. The next prime is 1221552543073. The reversal of 1221552543043 is 3403452551221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1221552543043 - 2⁵ = 1221552543011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221552542993 and 1221552543011.

It is not an unprimeable number, because it can be changed into a prime (1221552543073) 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, 20592873 + ... + 20652106.

It is an arithmetic number, because the mean of its divisors is an integer number (174548755360).

Almost surely, 2^{1221552543043} is an apocalyptic number.

1221552543043 is a deficient number, since it is larger than the sum of its proper divisors (174837499837).

1221552543043 is an equidigital number, since it uses as much as digits as its factorization.

1221552543043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41249217.

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 1221552543043 in words is "one trillion, two hundred twenty-one billion, five hundred fifty-two million, five hundred forty-three thousand, forty-three".