1045556421 has 32 divisors (see below), whose sum is σ = 1724583168. Its totient is φ = 548674560.

The previous prime is 1045556419. The next prime is 1045556429. The reversal of 1045556421 is 1246555401.

It is not a de Polignac number, because 1045556421 - 2¹ = 1045556419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045556429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44061 + ... + 63501.

It is an arithmetic number, because the mean of its divisors is an integer number (53893224).

Almost surely, 2^1045556421 is an apocalyptic number.

It is an amenable number.

1045556421 is a deficient number, since it is larger than the sum of its proper divisors (679026747).

1045556421 is a wasteful number, since it uses less digits than its factorization.

1045556421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19661.

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

The square root of 1045556421 is about 32335.0648831883. The cubic root of 1045556421 is about 1014.9605397716.

The spelling of 1045556421 in words is "one billion, forty-five million, five hundred fifty-six thousand, four hundred twenty-one".