2501266021 has 8 divisors (see below), whose sum is σ = 2544759000. Its totient is φ = 2457853440.

The previous prime is 2501266007. The next prime is 2501266051. The reversal of 2501266021 is 1206621052.

It can be written as a sum of positive squares in 4 ways, for example, as 137945025 + 2363320996 = 11745^2 + 48614^2 .

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 2501266021 - 2¹⁷ = 2501134949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2501266051) 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, 44445 + ... + 83533.

It is an arithmetic number, because the mean of its divisors is an integer number (318094875).

Almost surely, 2^2501266021 is an apocalyptic number.

It is an amenable number.

2501266021 is a deficient number, since it is larger than the sum of its proper divisors (43492979).

2501266021 is a wasteful number, since it uses less digits than its factorization.

2501266021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40199.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2501266021 is about 50012.6586075965. The cubic root of 2501266021 is about 1357.4378702825.

Adding to 2501266021 its reverse (1206621052), we get a palindrome (3707887073).

The spelling of 2501266021 in words is "two billion, five hundred one million, two hundred sixty-six thousand, twenty-one".