700021 has 4 divisors (see below), whose sum is σ = 800032. Its totient is φ = 600012.

The previous prime is 700001. The next prime is 700027. The reversal of 700021 is 120007.

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 an emirpimes, since its reverse is a distinct semiprime: 120007 = 41 ⋅2927.

It is not a de Polignac number, because 700021 - 2¹¹ = 697973 is a prime.

It is an Ulam number.

It is a Duffinian number.

700021 is a modest number, since divided by 21 gives 7 as remainder.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 699980 and 700007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (700027) 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, 49995 + ... + 50008.

It is an arithmetic number, because the mean of its divisors is an integer number (200008).

2⁷⁰⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

700021 is a deficient number, since it is larger than the sum of its proper divisors (100011).

700021 is a wasteful number, since it uses less digits than its factorization.

700021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100010.

The product of its (nonzero) digits is 14, while the sum is 10.

The square root of 700021 is about 836.6725763404. The cubic root of 700021 is about 88.7912880694.

Subtracting from 700021 its product of nonzero digits (14), we obtain a palindrome (700007).

Adding to 700021 its reverse (120007), we get a palindrome (820028).

It can be divided in two parts, 7000 and 21, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 700021 in words is "seven hundred thousand, twenty-one", and thus it is an iban number.