1045850021 has 4 divisors (see below), whose sum is σ = 1045914732. Its totient is φ = 1045785312.

The previous prime is 1045850011. The next prime is 1045850027. The reversal of 1045850021 is 1200585401.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1200585401 = 631 ⋅1902671.

It can be written as a sum of positive squares in 2 ways, for example, as 415588996 + 630261025 = 20386^2 + 25105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1045850021 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 (1045850027) 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, 14681 + ... + 48033.

It is an arithmetic number, because the mean of its divisors is an integer number (261478683).

Almost surely, 2^1045850021 is an apocalyptic number.

It is an amenable number.

1045850021 is a deficient number, since it is larger than the sum of its proper divisors (64711).

1045850021 is an equidigital number, since it uses as much as digits as its factorization.

1045850021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64710.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 1045850021 is about 32339.6045275758. The cubic root of 1045850021 is about 1015.0555336970.

The spelling of 1045850021 in words is "one billion, forty-five million, eight hundred fifty thousand, twenty-one".