2021002501 has 18 divisors (see below), whose sum is σ = 2364099282. Its totient is φ = 1722651840.

The previous prime is 2021002481. The next prime is 2021002513. The reversal of 2021002501 is 1052001202.

It can be written as a sum of positive squares in 3 ways, for example, as 781258401 + 1239744100 = 27951^2 + 35210^2 .

It is not a de Polignac number, because 2021002501 - 2¹⁵ = 2020969733 is a prime.

It is a super-2 number, since 2×2021002501² = 8168902218096510002, 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 (2021002601) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4800271 + ... + 4800691.

It is an arithmetic number, because the mean of its divisors is an integer number (131338849).

Almost surely, 2^2021002501 is an apocalyptic number.

It is an amenable number.

2021002501 is a deficient number, since it is larger than the sum of its proper divisors (343096781).

2021002501 is an frugal number, since it uses more digits than its factorization.

2021002501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061 (or 741 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 2021002501 is about 44955.5614023449. The cubic root of 2021002501 is about 1264.3159504756.

Adding to 2021002501 its reverse (1052001202), we get a palindrome (3073003703).

It can be divided in two parts, 202 and 1002501, that multiplied together give a palindrome (202505202).

The spelling of 2021002501 in words is "two billion, twenty-one million, two thousand, five hundred one".