2106250857 has 14 divisors (see below), whose sum is σ = 3157932762. Its totient is φ = 1404166752.

The previous prime is 2106250841. The next prime is 2106250877. The reversal of 2106250857 is 7580526012.

It is a happy number.

2106250857 is a `hidden beast` number, since 21 + 0 + 625 + 0 + 8 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2074711401 + 31539456 = 45549^2 + 5616^2 .

It is not a de Polignac number, because 2106250857 - 2⁴ = 2106250841 is a prime.

It is a super-3 number, since 3×2106250857³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (2106250807) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1443888 + ... + 1445345.

Almost surely, 2^2106250857 is an apocalyptic number.

2106250857 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2106250857 is a deficient number, since it is larger than the sum of its proper divisors (1051681905).

2106250857 is an frugal number, since it uses more digits than its factorization.

2106250857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889251 (or 2889236 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 2106250857 is about 45893.9087134665. The cubic root of 2106250857 is about 1281.8484964270.

Adding to 2106250857 its reverse (7580526012), we get a palindrome (9686776869).

The spelling of 2106250857 in words is "two billion, one hundred six million, two hundred fifty thousand, eight hundred fifty-seven".