250280000021 has 4 divisors (see below), whose sum is σ = 253295421792. Its totient is φ = 247264578252.

The previous prime is 250279999987. The next prime is 250280000027. The reversal of 250280000021 is 120000082052.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-250280000021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 250279999948 and 250280000002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (250280000027) 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, 1507710761 + ... + 1507710926.

It is an arithmetic number, because the mean of its divisors is an integer number (63323855448).

Almost surely, 2^250280000021 is an apocalyptic number.

It is an amenable number.

250280000021 is a deficient number, since it is larger than the sum of its proper divisors (3015421771).

250280000021 is an equidigital number, since it uses as much as digits as its factorization.

250280000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015421770.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 250280000021 its reverse (120000082052), we get a palindrome (370280082073).

The spelling of 250280000021 in words is "two hundred fifty billion, two hundred eighty million, twenty-one", and thus it is an aban number.