1221530455041 has 64 divisors (see below), whose sum is σ = 1843441528320. Its totient is φ = 714289766400.

The previous prime is 1221530455027. The next prime is 1221530455049. The reversal of 1221530455041 is 1405540351221.

It is not a de Polignac number, because 1221530455041 - 2²⁵ = 1221496900609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221530454993 and 1221530455011.

It is not an unprimeable number, because it can be changed into a prime (1221530455049) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19044561 + ... + 19108593.

It is an arithmetic number, because the mean of its divisors is an integer number (28803773880).

Almost surely, 2^{1221530455041} is an apocalyptic number.

It is an amenable number.

1221530455041 is a deficient number, since it is larger than the sum of its proper divisors (621911073279).

1221530455041 is a wasteful number, since it uses less digits than its factorization.

1221530455041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64346.

The product of its (nonzero) digits is 24000, while the sum is 33.

The spelling of 1221530455041 in words is "one trillion, two hundred twenty-one billion, five hundred thirty million, four hundred fifty-five thousand, forty-one".