7020001000021 has 8 divisors (see below), whose sum is σ = 7152643260504. Its totient is φ = 6887365754880.

The previous prime is 7020001000003. The next prime is 7020001000057. The reversal of 7020001000021 is 1200001000207.

It can be written as a sum of positive squares in 4 ways, for example, as 802403892900 + 6217597107121 = 895770^2 + 2493511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7020001000021 - 2¹⁵ = 7020000967253 is a prime.

It is a super-4 number, since 4×7020001000021⁴ (a number of 52 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7020000999965 and 7020001000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7020001000121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288661 + ... + 3758101.

It is an arithmetic number, because the mean of its divisors is an integer number (894080407563).

Almost surely, 2^{7020001000021} is an apocalyptic number.

It is an amenable number.

7020001000021 is a deficient number, since it is larger than the sum of its proper divisors (132642260483).

7020001000021 is a wasteful number, since it uses less digits than its factorization.

7020001000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3507671.

The product of its (nonzero) digits is 28, while the sum is 13.

Adding to 7020001000021 its reverse (1200001000207), we get a palindrome (8220002000228).

The spelling of 7020001000021 in words is "seven trillion, twenty billion, one million, twenty-one", and thus it is an aban number and an uban number.