10070821 has 4 divisors (see below), whose sum is σ = 10097100. Its totient is φ = 10044544.

The previous prime is 10070813. The next prime is 10070833. The reversal of 10070821 is 12807001.

10070821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12807001 = 17 ⋅753353.

It can be written as a sum of positive squares in 2 ways, for example, as 6502500 + 3568321 = 2550^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 10070821 - 2³ = 10070813 is a prime.

It is a super-2 number, since 2×10070821² = 202842871228082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10070891) 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, 12556 + ... + 13333.

It is an arithmetic number, because the mean of its divisors is an integer number (2524275).

Almost surely, 2^10070821 is an apocalyptic number.

It is an amenable number.

10070821 is a deficient number, since it is larger than the sum of its proper divisors (26279).

10070821 is an equidigital number, since it uses as much as digits as its factorization.

10070821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26278.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 10070821 is about 3173.4556874171. The cubic root of 10070821 is about 215.9508704563.

Adding to 10070821 its reverse (12807001), we get a palindrome (22877822).

The spelling of 10070821 in words is "ten million, seventy thousand, eight hundred twenty-one".