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20102111257 is a prime number
BaseRepresentation
bin10010101110001011…
…011110000000011001
31220212221200001120011
4102232023132000121
5312132120030012
613122414001521
71311102061234
oct225613360031
956787601504
1020102111257
118586132798
123a901a62a1
131b848aa3b7
14d89aa641b
157c9bdb1a7
hex4ae2de019

20102111257 has 2 divisors, whose sum is σ = 20102111258. Its totient is φ = 20102111256.

The previous prime is 20102111189. The next prime is 20102111311. The reversal of 20102111257 is 75211120102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11715031696 + 8387079561 = 108236^2 + 91581^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102111257 - 27 = 20102111129 is a prime.

It is a super-2 number, since 2×201021112572 (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20102111357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051055628 + 10051055629.

It is an arithmetic number, because the mean of its divisors is an integer number (10051055629).

Almost surely, 220102111257 is an apocalyptic number.

It is an amenable number.

20102111257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102111257 is an equidigital number, since it uses as much as digits as its factorization.

20102111257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 22.

Adding to 20102111257 its reverse (75211120102), we get a palindrome (95313231359).

The spelling of 20102111257 in words is "twenty billion, one hundred two million, one hundred eleven thousand, two hundred fifty-seven".