1225540315021 has 4 divisors (see below), whose sum is σ = 1336953070944. Its totient is φ = 1114127559100.

The previous prime is 1225540315009. The next prime is 1225540315133. The reversal of 1225540315021 is 1205130455221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1225540315021 - 2¹⁹ = 1225539790733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225540325021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55706377945 + ... + 55706377966.

It is an arithmetic number, because the mean of its divisors is an integer number (334238267736).

Almost surely, 2^{1225540315021} is an apocalyptic number.

1225540315021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1225540315021 is a deficient number, since it is larger than the sum of its proper divisors (111412755923).

1225540315021 is a wasteful number, since it uses less digits than its factorization.

1225540315021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111412755922.

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

The spelling of 1225540315021 in words is "one trillion, two hundred twenty-five billion, five hundred forty million, three hundred fifteen thousand, twenty-one".