1047070021 has 4 divisors (see below), whose sum is σ = 1047135232. Its totient is φ = 1047004812.

The previous prime is 1047070019. The next prime is 1047070033. The reversal of 1047070021 is 1200707401.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1047070021 - 2¹ = 1047070019 is a prime.

It is a super-3 number, since 3×1047070021³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1047069974 and 1047070001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1047070051) 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, 10300 + ... + 46906.

It is an arithmetic number, because the mean of its divisors is an integer number (261783808).

Almost surely, 2^1047070021 is an apocalyptic number.

It is an amenable number.

1047070021 is a deficient number, since it is larger than the sum of its proper divisors (65211).

1047070021 is an equidigital number, since it uses as much as digits as its factorization.

1047070021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65210.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 1047070021 is about 32358.4613509357. The cubic root of 1047070021 is about 1015.4500729117.

Adding to 1047070021 its reverse (1200707401), we get a palindrome (2247777422).

The spelling of 1047070021 in words is "one billion, forty-seven million, seventy thousand, twenty-one".