7020020021 has 16 divisors (see below), whose sum is σ = 8098970880. Its totient is φ = 5960355840.

The previous prime is 7020020011. The next prime is 7020020039. The reversal of 7020020021 is 1200200207.

It is a cyclic number.

It is not a de Polignac number, because 7020020021 - 2²² = 7015825717 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7020019978 and 7020020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7020020011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314840 + ... + 336398.

It is an arithmetic number, because the mean of its divisors is an integer number (506185680).

Almost surely, 2^7020020021 is an apocalyptic number.

It is an amenable number.

7020020021 is a deficient number, since it is larger than the sum of its proper divisors (1078950859).

7020020021 is a wasteful number, since it uses less digits than its factorization.

7020020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22004.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 7020020021 is about 83785.5597403276. The cubic root of 7020020021 is about 1914.7531099428.

Adding to 7020020021 its reverse (1200200207), we get a palindrome (8220220228).

The spelling of 7020020021 in words is "seven billion, twenty million, twenty thousand, twenty-one".