1053870021 has 20 divisors (see below), whose sum is σ = 1575247212. Its totient is φ = 702157248.

The previous prime is 1053870019. The next prime is 1053870029. The reversal of 1053870021 is 1200783501.

It can be written as a sum of positive squares in 2 ways, for example, as 239909121 + 813960900 = 15489^2 + 28530^2 .

It is not a de Polignac number, because 1053870021 - 2¹ = 1053870019 is a prime.

It is a super-2 number, since 2×1053870021² = 2221284042325080882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1053870029) 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 19 ways as a sum of consecutive naturals, for example, 191115 + ... + 196551.

Almost surely, 2^1053870021 is an apocalyptic number.

It is an amenable number.

1053870021 is a deficient number, since it is larger than the sum of its proper divisors (521377191).

1053870021 is an equidigital number, since it uses as much as digits as its factorization.

1053870021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7842 (or 7833 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 1053870021 is about 32463.3642896111. The cubic root of 1053870021 is about 1017.6435480957.

The spelling of 1053870021 in words is "one billion, fifty-three million, eight hundred seventy thousand, twenty-one".